This document summarizes four spectroscopic methods for determining the individual component concentrations in mixtures with overlapping absorption bands. It describes a model system using two overlapping Lorentz functions to represent absorption spectra. Experimental analysis was conducted on mixtures of chlorobenzene and o-dichlorobenzene in the infrared region. Two methods were compared: Method I used absorbances at band maxima with a square K matrix; Method II used absorbances across bands with a rectangular K matrix and least squares calculations. The goal was to evaluate accuracy and precision with varying band overlap.
This document discusses applications of visible and UV spectrometry. It provides examples of how colorimetry can be used to quantify inorganic compounds, biochemical specimens, and organic and pharmaceutical compounds by converting them to colored derivatives. It also discusses using UV spectrometry for quantitative analysis through methods like standard absorptivity, calibration curves, and simultaneous equations. Qualitative applications include detecting functional groups, conjugation, distinguishing conjugated/non-conjugated compounds, identifying unknown compounds and determining structural elucidation.
Combination drugs containing Paracetamol and Aspirin, displayed in Figure 1, are widely used analgesics with anti-inflammatory properties for treatment of migraines. Both active ingredients have a similar mode of action, whereby they inhibit the cyclooxygenase (COX) enzyme, by preventing the production of prostaglandins which cause pain, inflammation, and fever. UV/Vis spectrometry is a fast and commonly used technique in quality control laboratories for routine analysis of purity and quantity of components within various stages of a product’s manufacture in many industries.
The document discusses various spectrophotometric methods for analyzing drug samples containing multiple absorbing components, including simultaneous equation method. The simultaneous equation method allows determination of concentration of two drugs (X and Y) that absorb at each other's wavelength maxima. It requires knowing the absorptivity of each drug at the two wavelengths and the sample absorbances at those wavelengths to set up two equations and solve for the unknown concentrations. Certain criteria on absorbance ratios must be met for precise results.
The document discusses the basic concepts of chemical analysis including qualitative and quantitative analysis, classical and modern instrumental analysis methods, sources of error such as random, systematic and gross errors, and ways to evaluate precision and accuracy such as through replicates, standard deviation, and analysis of reference standards.
This document proposes an approach for interactively smoothing experimental data using a Savitzky-Golay (S-G) filter. An optimization problem is formulated to minimize two criteria: total absolute error and integral smoothness. Pareto optimal solutions are determined for the filter parameters of polynomial degree and number of supporting points. The μ-selection method is used to find subsets of Pareto optimal solutions ranked by compromised efficiency. The highest ranked solution is the Salukvadze optimum that balances the criteria most evenly. The approach allows choosing S-G filter parameters that adequately represent and smooth the data. An example applies this to smooth measured acceleration data from a vibrating mechanism.
This document discusses Vierordt's method, a technique for simultaneous multicomponent analysis using UV-VIS spectrometry. It involves measuring absorbances at multiple wavelengths to generate equations that can be solved to determine the concentrations of each component in a mixture. The key steps include measuring calibration curves for each component at different wavelengths, measuring the sample mixture absorbances, and simultaneously solving the equations derived from Beer's law. Advantages include avoiding separation techniques and allowing simultaneous analysis, while requirements include components having distinct absorption profiles and obeying Beer's law. Applications described include pharmaceutical drug analysis using this spectroscopic method.
Method development and validation of simultaneous estimation of paracetamol &...SriramNagarajan19
A drug may be defined as a substance meant for diagnosis, cure, mitigation, prevention or treatment of diseases in human beings or animals or for alternating any structure or function of the body of human being or animals. Pharmaceutical chemistry is a science that makes use of general laws of chemistry to study drugs i.e. their preparation, chemical natures, composition, structure, influence on an organism and studies the physical and chemical properties of drugs, the methods of quality control and the conditions of their storage etc. the family of drugs may be broadly classified as.
1. Pharmacodynamic agents.
2. Chemotherapeutic agents.
It is necessary to find the content of each drug either in pure or single, combined dosage forms for purity testing. It is also essential to know the concentration of the drug and it’s metabolites in biological fluids after taking the dosage form for treatment.
The scope of developing and validating analytical methods is to ensure a suitable method for a particular analyte more specific, accurate and precise. The main objective for that is to improve the conditions and parameters, which should be followed in the development and validation.
Analytical chemistry has been important since the early days of chemistry and provides methods to determine what elements and chemicals are present in a sample. Traditional techniques like qualitative analysis to determine presence/absence of compounds and quantitative analysis methods like gravimetric analysis and titration, along with modern instrumental techniques like spectroscopy, mass spectrometry, and chromatography, form the foundation of analytical chemistry. New hybrid techniques that combine multiple analytical methods are also increasingly used.
This document discusses applications of visible and UV spectrometry. It provides examples of how colorimetry can be used to quantify inorganic compounds, biochemical specimens, and organic and pharmaceutical compounds by converting them to colored derivatives. It also discusses using UV spectrometry for quantitative analysis through methods like standard absorptivity, calibration curves, and simultaneous equations. Qualitative applications include detecting functional groups, conjugation, distinguishing conjugated/non-conjugated compounds, identifying unknown compounds and determining structural elucidation.
Combination drugs containing Paracetamol and Aspirin, displayed in Figure 1, are widely used analgesics with anti-inflammatory properties for treatment of migraines. Both active ingredients have a similar mode of action, whereby they inhibit the cyclooxygenase (COX) enzyme, by preventing the production of prostaglandins which cause pain, inflammation, and fever. UV/Vis spectrometry is a fast and commonly used technique in quality control laboratories for routine analysis of purity and quantity of components within various stages of a product’s manufacture in many industries.
The document discusses various spectrophotometric methods for analyzing drug samples containing multiple absorbing components, including simultaneous equation method. The simultaneous equation method allows determination of concentration of two drugs (X and Y) that absorb at each other's wavelength maxima. It requires knowing the absorptivity of each drug at the two wavelengths and the sample absorbances at those wavelengths to set up two equations and solve for the unknown concentrations. Certain criteria on absorbance ratios must be met for precise results.
The document discusses the basic concepts of chemical analysis including qualitative and quantitative analysis, classical and modern instrumental analysis methods, sources of error such as random, systematic and gross errors, and ways to evaluate precision and accuracy such as through replicates, standard deviation, and analysis of reference standards.
This document proposes an approach for interactively smoothing experimental data using a Savitzky-Golay (S-G) filter. An optimization problem is formulated to minimize two criteria: total absolute error and integral smoothness. Pareto optimal solutions are determined for the filter parameters of polynomial degree and number of supporting points. The μ-selection method is used to find subsets of Pareto optimal solutions ranked by compromised efficiency. The highest ranked solution is the Salukvadze optimum that balances the criteria most evenly. The approach allows choosing S-G filter parameters that adequately represent and smooth the data. An example applies this to smooth measured acceleration data from a vibrating mechanism.
This document discusses Vierordt's method, a technique for simultaneous multicomponent analysis using UV-VIS spectrometry. It involves measuring absorbances at multiple wavelengths to generate equations that can be solved to determine the concentrations of each component in a mixture. The key steps include measuring calibration curves for each component at different wavelengths, measuring the sample mixture absorbances, and simultaneously solving the equations derived from Beer's law. Advantages include avoiding separation techniques and allowing simultaneous analysis, while requirements include components having distinct absorption profiles and obeying Beer's law. Applications described include pharmaceutical drug analysis using this spectroscopic method.
Method development and validation of simultaneous estimation of paracetamol &...SriramNagarajan19
A drug may be defined as a substance meant for diagnosis, cure, mitigation, prevention or treatment of diseases in human beings or animals or for alternating any structure or function of the body of human being or animals. Pharmaceutical chemistry is a science that makes use of general laws of chemistry to study drugs i.e. their preparation, chemical natures, composition, structure, influence on an organism and studies the physical and chemical properties of drugs, the methods of quality control and the conditions of their storage etc. the family of drugs may be broadly classified as.
1. Pharmacodynamic agents.
2. Chemotherapeutic agents.
It is necessary to find the content of each drug either in pure or single, combined dosage forms for purity testing. It is also essential to know the concentration of the drug and it’s metabolites in biological fluids after taking the dosage form for treatment.
The scope of developing and validating analytical methods is to ensure a suitable method for a particular analyte more specific, accurate and precise. The main objective for that is to improve the conditions and parameters, which should be followed in the development and validation.
Analytical chemistry has been important since the early days of chemistry and provides methods to determine what elements and chemicals are present in a sample. Traditional techniques like qualitative analysis to determine presence/absence of compounds and quantitative analysis methods like gravimetric analysis and titration, along with modern instrumental techniques like spectroscopy, mass spectrometry, and chromatography, form the foundation of analytical chemistry. New hybrid techniques that combine multiple analytical methods are also increasingly used.
This document provides an overview of pharmaceutical analysis techniques. It discusses qualitative and quantitative analysis, various analytical methods including chemical, physical and biological methods. It describes different techniques for expressing concentration such as molarity, normality, percent solutions. It also discusses primary and secondary standards used for standardization of analytical methods and preparation of common standard solutions like hydrochloric acid, sodium hydroxide and sodium thiosulfate. The document aims to introduce fundamental concepts of pharmaceutical analysis.
RELATIONSHIPS BETWEEN ELEMENTAL CARBON CONTENTS AND HEATING VALUES OF LIGNINS Michal Jablonsky
Two precipitated lignins and seven commercial lignins were used in this study for predicting the correlation between higher heating values (HHV) and their carbon content. There was found a highly significant linear correlation between the HHV of the lignin and its C contents. The content of C was determined by elemental analysis. The HHV (MJ/kg) of lignin was calculated using the following equation: HHV = 0.40659(C), for which the correlation coefficient was: 0.9987. HHV prediction was applied to samples of 17 different lignins and data for 53 samples of several biomass resources obtained from literature. The HHVs calculated from this equation showed a mean difference of 0.49 % for different lignins and 2.13 % for biomass resources.
QSAR attempts to correlate biological activity to measurable physicochemical properties through mathematical equations. It relates parameters like lipophilicity (log P), electronic effects (Hammett constants), and steric effects to biological response. Various QSAR methods exist, including Hansch analysis which uses these substituent constants in its equations. More advanced techniques like CoMFA analyze fields around aligned molecules to model activity landscapes and identify favorable regions for activity. QSAR provides a framework for drug design and predicting activities of untested compounds.
Introduction to Pharmaceutical analysis - I (HRB)Harshadaa bafna
This document discusses pharmaceutical analysis, which involves identifying, quantifying, and purifying substances and mixtures. It describes various analytical techniques like volumetric, electrochemical, spectroscopic, and chromatographic methods. It also discusses primary and secondary standards, methods of expressing concentration such as molarity and molality, sources of errors and how to minimize them, and pharmacopoeias which establish drug standards.
Construction of calibration curve for uv-spectroscopic analysis of Paracetamol.Protik Biswas
This document describes constructing a calibration curve for UV spectroscopic analysis of paracetamol. Standard solutions of paracetamol with known concentrations are prepared and their absorbance measured. A graph is made of concentration versus absorbance, from which a linear regression equation is determined. This equation is then used to determine unknown concentrations of paracetamol samples based on their measured absorbance.
analytical techniques for estimation of organic compoundsRabia Aziz
more chemistry contents are available
1. pdf file on Termmate: https://www.termmate.com/rabia.aziz
2. YouTube: https://www.youtube.com/channel/UCKxWnNdskGHnZFS0h1QRTEA
3. Facebook: https://web.facebook.com/Chemist.Rabia.Aziz/
4. Blogger: https://chemistry-academy.blogspot.com/
ANALYTICAL TECHNIQUES FOR ESTIMATION OF ORGANIC COMPOUNDS
1) Gas chromatography mass spectrometry (GC-MS) is a hyphenated technique that combines gas chromatography and mass spectrometry to identify different molecules within a sample.
2) GC separates the components in a mixture through partitioning between a mobile and stationary phase, while MS identifies molecules by detecting their mass.
3) Common ionization techniques used in GC-MS include electron impact and chemical ionization. Mass analyzers like quadrupole, ion trap, and time-of-flight are used to detect ions.
4) GC-MS has applications in pharmaceutical analysis, forensics, anti-doping testing, and newborn screening for inborn errors of metabolism.
This document summarizes the development of a method for detecting five pesticides (alachlor, malathion, dimethoate, chlorpyrifos and metribuzin) in water samples using liquid chromatography-tandem mass spectrometry. Seven concentrations of each pesticide were tested to determine correlation coefficients and accuracy. The specificity of the 4000 Q-trap mass spectrometer allowed elimination of interfering components and detection limits down to the μg/L level. The method was applied to 13 water samples, in which malathion and alachlor were detected in all samples at concentrations from 0.004 to 0.691 μg/L, exceeding Indian standards.
This short presentation describes the principles of measuring lipophilicty and bio-mimetic properties, such as protein and phospholipid binding by HPLC. These data can be used to model compound's in vivo distribution.
Physicochemical Properties and Proposed Mechanism in the Obtainment of 4-Hidr...IJERA Editor
The mechanism for the poly-condensation event of conjugated polymers with ending 4-hydroxycoumarin has
been proposed. It happened under H2SO4 acidic conditions only using enolic-coumarins without any substituent
at third position. It was studied using Matrix assisted laser desorption/ionization time-of-flight (MALDI-Tof)
mass spectrometry. Besides, some physicochemical properties were analyzed using Thermo-gravimetric (TGA),
X-ray and UV-Vis analysis
Gas chromatography-mass spectrometry (GC-MS)-an introductionRaj Kumar
This document provides information about gas chromatography-mass spectrometry (GC-MS). It discusses that GC-MS combines gas chromatography and mass spectrometry to separate and identify organic compounds in a sample. The sample is vaporized and carried by a gas through a column where components are separated. The separated components enter the mass spectrometer where they are ionized and their mass detected to identify each compound. The document outlines the principle, instrumentation, sample requirements, and applications of GC-MS, such as environmental monitoring, forensics, and food and drug analysis.
Development and Validation of a Spectrophotometric method using Vierordt’s Me...SriramNagarajan19
Objective: The objective of the current study was to develop rapid, accurate, reproducible, validated and economical Vierordt’s Method for the simultaneous determination of CEF and MOX in tablet dosage forms. Method: This method of analysis was based upon the absorption of drugs at wavelength maximum of each other. Two wavelengths of 289.10 and 295.10 nm were selected which are the λmax of two drugs for the development of the simultaneous equations. The absorbance of CEF and MOX were measured and the absorptivity values were determined at all the two selected wavelengths. Result & Discussion: The linearity was found to be 3-9µg/ml for CEF & MOX respectively. Recovery was in the range of 98 –102%; the values of standard deviation and% R.S.D. were found to be <2% shows the high accuracy of the method. The Limit of Detection and Limit of Quantitation were theoretically calculated which were found to be 0.0224 and 0.0678 for CEF and 0.0070 and 0.0214 for MOX respectively. Robustness and Ruggedness were also carried out and percentage RSD was found to be less than 2.0 %. The assay of Cefixime and Moxifloxacin was found to be 99.36% and 98.75%.The proposed method has been validated as per ICH guidelines and successfully applied to the estimation of CEF and MOX in their combined Tablet dosage form.
Oxidative Coupling: A Tranquil Approach for Determination of Selexipag by Vis...Ratnakaram Venkata Nadh
The present study is a first report on development of a spectrophotometric method for determination of selexipag (used to cure pulmonary arterial hypertension) in bulk and tablet formulation and its validation. The basis of the proposed method is formation of a chromophore (of λ max 600 nm) in presence of acidic ferric chloride by oxidative coupling reaction between selexipag and MBTH (3-methylbenzo-thiazolin-2-one hydrazone) solution. Regression analysis (r > 0.999) shows that the plotted calibration curve exhibits good linearity in the studied range of concentration (5 – 30 μg mL-1). As per the existing guidelines of ICH, various parameters of the method were tested for validation. Low values of R.S.D. (< 2%) were observed indicating that the proposed method is reproducible, accurate and precise
Ion-pair Formation for the Determination of Mianserin Using Fast Sulphon Black FRatnakaram Venkata Nadh
This document presents a method for the colorimetric determination of the antidepressant drug mianserin using Fast Sulphon Black F (FSBF) dye. Reaction conditions were optimized to form a soluble colored ion-pair complex between the protonated form of mianserin and the anionic form of FSBF in dichloromethane. The method was validated according to ICH guidelines and showed good linearity, accuracy, precision and recovery for mianserin quantification. The developed method was successfully applied to determine mianserin levels in tablet formulations.
Overview of means & methods used in structural elucidation of natural products. Presentation Topic Given by Faculty, It is compulsory because for this we are having our internal marks.
The document summarizes an experiment investigating the effect of concentration and temperature on the rate of a Harcourt-Essen reaction. By varying the concentration of iodide ions between runs, the reaction was found to be second order overall and first order with respect to both peroxide ions and iodide ions. Increasing the temperature between runs caused the rate coefficient to increase, demonstrating that the reaction rate increases with temperature in accordance with the Arrhenius equation.
Analytical Solutions of simultaneous Linear Differential Equations in Chemica...IJMERJOURNAL
ABSTRACT: Analytical method for solving homogeneous linear differential equations in chemical kinetics and pharmacokinetics using homotopy perturbation method has been proposed. The mathematical model that depicts the pharmacokinetics is solved. Herein, we report the closed form of an analytical expression for concentrations species for all values of kinetic parameters. These results are compared with numerical results and are found to be in satisfactory agreement. The obtained results are valid for the whole solution domain.
Analytical chemistry deals with determining the chemical composition of samples through qualitative and quantitative analysis. It has applications in fields like environmental science, clinical chemistry, and forensic science. Instrumental methods like spectroscopy, chromatography, and electroanalytical techniques are now commonly used for separation and analysis. These methods measure properties of samples like light absorption, emission spectra, electrical conductivity or potential to determine composition. Classical wet chemical methods like titration and gravimetry are also still used. Proper sampling, sample preparation, and control of instrumental factors are important for obtaining accurate results.
Analytical instrumentation provides qualitative and quantitative information about the composition of samples. It comprises four basic elements - a chemical information source, transducers, signal conditioners, and a display system. The document discusses analytical methods, selecting an appropriate method, understanding the measurement process, uses of microcomputers, Beer-Lambert law, spectroscopy, radiation sources, optical fibers, monochromators, and detectors.
1 s2.0-s037838121100207 x-main.correlation of thermodynamic modeling and mole...Josemar Pereira da Silva
The document describes a method for correlating thermodynamic modeling and molecular simulations to predict liquid-liquid equilibrium in ternary polymer mixtures. The method uses a modified double lattice theory thermodynamic model combined with molecular simulations to determine interaction energy parameters. Dummy atoms are used to represent polymer segments in the simulations. The method is applied to four real ternary polymer systems, with the energy parameters directly used in the thermodynamic model. The results show good agreement with experimental observations using one or no adjustable parameters.
1 s2.0-s037838121100207 x-main.correlation of thermodynamic modeling and mole...Josemar Pereira da Silva
The document describes a method for correlating thermodynamic modeling and molecular simulations to predict liquid-liquid equilibrium in ternary polymer mixtures. The method uses a modified double lattice theory thermodynamic model combined with molecular simulations to determine interaction energy parameters. Dummy atoms are used to represent polymer segments in the simulations. The method is applied to four real ternary polymer systems, with the energy parameters directly used in the thermodynamic model. The results show good agreement with experimental observations using one or no adjustable parameters.
This document provides an overview of pharmaceutical analysis techniques. It discusses qualitative and quantitative analysis, various analytical methods including chemical, physical and biological methods. It describes different techniques for expressing concentration such as molarity, normality, percent solutions. It also discusses primary and secondary standards used for standardization of analytical methods and preparation of common standard solutions like hydrochloric acid, sodium hydroxide and sodium thiosulfate. The document aims to introduce fundamental concepts of pharmaceutical analysis.
RELATIONSHIPS BETWEEN ELEMENTAL CARBON CONTENTS AND HEATING VALUES OF LIGNINS Michal Jablonsky
Two precipitated lignins and seven commercial lignins were used in this study for predicting the correlation between higher heating values (HHV) and their carbon content. There was found a highly significant linear correlation between the HHV of the lignin and its C contents. The content of C was determined by elemental analysis. The HHV (MJ/kg) of lignin was calculated using the following equation: HHV = 0.40659(C), for which the correlation coefficient was: 0.9987. HHV prediction was applied to samples of 17 different lignins and data for 53 samples of several biomass resources obtained from literature. The HHVs calculated from this equation showed a mean difference of 0.49 % for different lignins and 2.13 % for biomass resources.
QSAR attempts to correlate biological activity to measurable physicochemical properties through mathematical equations. It relates parameters like lipophilicity (log P), electronic effects (Hammett constants), and steric effects to biological response. Various QSAR methods exist, including Hansch analysis which uses these substituent constants in its equations. More advanced techniques like CoMFA analyze fields around aligned molecules to model activity landscapes and identify favorable regions for activity. QSAR provides a framework for drug design and predicting activities of untested compounds.
Introduction to Pharmaceutical analysis - I (HRB)Harshadaa bafna
This document discusses pharmaceutical analysis, which involves identifying, quantifying, and purifying substances and mixtures. It describes various analytical techniques like volumetric, electrochemical, spectroscopic, and chromatographic methods. It also discusses primary and secondary standards, methods of expressing concentration such as molarity and molality, sources of errors and how to minimize them, and pharmacopoeias which establish drug standards.
Construction of calibration curve for uv-spectroscopic analysis of Paracetamol.Protik Biswas
This document describes constructing a calibration curve for UV spectroscopic analysis of paracetamol. Standard solutions of paracetamol with known concentrations are prepared and their absorbance measured. A graph is made of concentration versus absorbance, from which a linear regression equation is determined. This equation is then used to determine unknown concentrations of paracetamol samples based on their measured absorbance.
analytical techniques for estimation of organic compoundsRabia Aziz
more chemistry contents are available
1. pdf file on Termmate: https://www.termmate.com/rabia.aziz
2. YouTube: https://www.youtube.com/channel/UCKxWnNdskGHnZFS0h1QRTEA
3. Facebook: https://web.facebook.com/Chemist.Rabia.Aziz/
4. Blogger: https://chemistry-academy.blogspot.com/
ANALYTICAL TECHNIQUES FOR ESTIMATION OF ORGANIC COMPOUNDS
1) Gas chromatography mass spectrometry (GC-MS) is a hyphenated technique that combines gas chromatography and mass spectrometry to identify different molecules within a sample.
2) GC separates the components in a mixture through partitioning between a mobile and stationary phase, while MS identifies molecules by detecting their mass.
3) Common ionization techniques used in GC-MS include electron impact and chemical ionization. Mass analyzers like quadrupole, ion trap, and time-of-flight are used to detect ions.
4) GC-MS has applications in pharmaceutical analysis, forensics, anti-doping testing, and newborn screening for inborn errors of metabolism.
This document summarizes the development of a method for detecting five pesticides (alachlor, malathion, dimethoate, chlorpyrifos and metribuzin) in water samples using liquid chromatography-tandem mass spectrometry. Seven concentrations of each pesticide were tested to determine correlation coefficients and accuracy. The specificity of the 4000 Q-trap mass spectrometer allowed elimination of interfering components and detection limits down to the μg/L level. The method was applied to 13 water samples, in which malathion and alachlor were detected in all samples at concentrations from 0.004 to 0.691 μg/L, exceeding Indian standards.
This short presentation describes the principles of measuring lipophilicty and bio-mimetic properties, such as protein and phospholipid binding by HPLC. These data can be used to model compound's in vivo distribution.
Physicochemical Properties and Proposed Mechanism in the Obtainment of 4-Hidr...IJERA Editor
The mechanism for the poly-condensation event of conjugated polymers with ending 4-hydroxycoumarin has
been proposed. It happened under H2SO4 acidic conditions only using enolic-coumarins without any substituent
at third position. It was studied using Matrix assisted laser desorption/ionization time-of-flight (MALDI-Tof)
mass spectrometry. Besides, some physicochemical properties were analyzed using Thermo-gravimetric (TGA),
X-ray and UV-Vis analysis
Gas chromatography-mass spectrometry (GC-MS)-an introductionRaj Kumar
This document provides information about gas chromatography-mass spectrometry (GC-MS). It discusses that GC-MS combines gas chromatography and mass spectrometry to separate and identify organic compounds in a sample. The sample is vaporized and carried by a gas through a column where components are separated. The separated components enter the mass spectrometer where they are ionized and their mass detected to identify each compound. The document outlines the principle, instrumentation, sample requirements, and applications of GC-MS, such as environmental monitoring, forensics, and food and drug analysis.
Development and Validation of a Spectrophotometric method using Vierordt’s Me...SriramNagarajan19
Objective: The objective of the current study was to develop rapid, accurate, reproducible, validated and economical Vierordt’s Method for the simultaneous determination of CEF and MOX in tablet dosage forms. Method: This method of analysis was based upon the absorption of drugs at wavelength maximum of each other. Two wavelengths of 289.10 and 295.10 nm were selected which are the λmax of two drugs for the development of the simultaneous equations. The absorbance of CEF and MOX were measured and the absorptivity values were determined at all the two selected wavelengths. Result & Discussion: The linearity was found to be 3-9µg/ml for CEF & MOX respectively. Recovery was in the range of 98 –102%; the values of standard deviation and% R.S.D. were found to be <2% shows the high accuracy of the method. The Limit of Detection and Limit of Quantitation were theoretically calculated which were found to be 0.0224 and 0.0678 for CEF and 0.0070 and 0.0214 for MOX respectively. Robustness and Ruggedness were also carried out and percentage RSD was found to be less than 2.0 %. The assay of Cefixime and Moxifloxacin was found to be 99.36% and 98.75%.The proposed method has been validated as per ICH guidelines and successfully applied to the estimation of CEF and MOX in their combined Tablet dosage form.
Oxidative Coupling: A Tranquil Approach for Determination of Selexipag by Vis...Ratnakaram Venkata Nadh
The present study is a first report on development of a spectrophotometric method for determination of selexipag (used to cure pulmonary arterial hypertension) in bulk and tablet formulation and its validation. The basis of the proposed method is formation of a chromophore (of λ max 600 nm) in presence of acidic ferric chloride by oxidative coupling reaction between selexipag and MBTH (3-methylbenzo-thiazolin-2-one hydrazone) solution. Regression analysis (r > 0.999) shows that the plotted calibration curve exhibits good linearity in the studied range of concentration (5 – 30 μg mL-1). As per the existing guidelines of ICH, various parameters of the method were tested for validation. Low values of R.S.D. (< 2%) were observed indicating that the proposed method is reproducible, accurate and precise
Ion-pair Formation for the Determination of Mianserin Using Fast Sulphon Black FRatnakaram Venkata Nadh
This document presents a method for the colorimetric determination of the antidepressant drug mianserin using Fast Sulphon Black F (FSBF) dye. Reaction conditions were optimized to form a soluble colored ion-pair complex between the protonated form of mianserin and the anionic form of FSBF in dichloromethane. The method was validated according to ICH guidelines and showed good linearity, accuracy, precision and recovery for mianserin quantification. The developed method was successfully applied to determine mianserin levels in tablet formulations.
Overview of means & methods used in structural elucidation of natural products. Presentation Topic Given by Faculty, It is compulsory because for this we are having our internal marks.
The document summarizes an experiment investigating the effect of concentration and temperature on the rate of a Harcourt-Essen reaction. By varying the concentration of iodide ions between runs, the reaction was found to be second order overall and first order with respect to both peroxide ions and iodide ions. Increasing the temperature between runs caused the rate coefficient to increase, demonstrating that the reaction rate increases with temperature in accordance with the Arrhenius equation.
Analytical Solutions of simultaneous Linear Differential Equations in Chemica...IJMERJOURNAL
ABSTRACT: Analytical method for solving homogeneous linear differential equations in chemical kinetics and pharmacokinetics using homotopy perturbation method has been proposed. The mathematical model that depicts the pharmacokinetics is solved. Herein, we report the closed form of an analytical expression for concentrations species for all values of kinetic parameters. These results are compared with numerical results and are found to be in satisfactory agreement. The obtained results are valid for the whole solution domain.
Analytical chemistry deals with determining the chemical composition of samples through qualitative and quantitative analysis. It has applications in fields like environmental science, clinical chemistry, and forensic science. Instrumental methods like spectroscopy, chromatography, and electroanalytical techniques are now commonly used for separation and analysis. These methods measure properties of samples like light absorption, emission spectra, electrical conductivity or potential to determine composition. Classical wet chemical methods like titration and gravimetry are also still used. Proper sampling, sample preparation, and control of instrumental factors are important for obtaining accurate results.
Analytical instrumentation provides qualitative and quantitative information about the composition of samples. It comprises four basic elements - a chemical information source, transducers, signal conditioners, and a display system. The document discusses analytical methods, selecting an appropriate method, understanding the measurement process, uses of microcomputers, Beer-Lambert law, spectroscopy, radiation sources, optical fibers, monochromators, and detectors.
1 s2.0-s037838121100207 x-main.correlation of thermodynamic modeling and mole...Josemar Pereira da Silva
The document describes a method for correlating thermodynamic modeling and molecular simulations to predict liquid-liquid equilibrium in ternary polymer mixtures. The method uses a modified double lattice theory thermodynamic model combined with molecular simulations to determine interaction energy parameters. Dummy atoms are used to represent polymer segments in the simulations. The method is applied to four real ternary polymer systems, with the energy parameters directly used in the thermodynamic model. The results show good agreement with experimental observations using one or no adjustable parameters.
1 s2.0-s037838121100207 x-main.correlation of thermodynamic modeling and mole...Josemar Pereira da Silva
The document describes a method for correlating thermodynamic modeling and molecular simulations to predict liquid-liquid equilibrium in ternary polymer mixtures. The method uses a modified double lattice theory thermodynamic model combined with molecular simulations to determine interaction energy parameters. Dummy atoms are used to represent polymer segments in the simulations. The method is applied to four real ternary polymer systems, with the energy parameters directly used in the thermodynamic model. The results show good agreement with experimental observations using one or no adjustable parameters.
This document presents a study on using an artificial neural network (ANN) and multi-sensor data to predict toxic gases. Researchers developed a multi-layer perceptron (MLP) neural network model using backpropagation to predict hydrogen sulfide, nitrogen dioxide, and their mixture using data from intelligent gas sensors. The network was trained on 160 samples and tested on the remaining 20 samples. Results showed the model with one hidden layer of 75 nodes achieved high prediction accuracy, approving the robustness of the developed ANN model for electronic nose prediction in challenging conditions like low gas concentrations and complex gas mixtures.
This document discusses error propagation in quantitative analysis based on ratio spectra. It presents the mathematical foundations for studying noise-filtering properties and error propagation using ratio spectra and mean-centered ratio spectra methods. Computer modeling was performed to evaluate the standard deviation ratios and condition numbers for binary mixtures modeled by Gaussian doublets, showing the mean-centered ratio spectra method is more advantageous for proportional noise typical of UV-VIS instruments. The advantages and limitations of using ratio spectra methods are discussed.
Undetermined Mixing Matrix Estimation Base on Classification and CountingIJRESJOURNAL
ABSTRACT: This paper introduces the mixing matrix estimation algorithms about undetermined blind source separation. Contrapose the difficulty to determine the parameters, the complex calculations in potential function method and the difficulty to confirm the cluster centers in method of clustering, we propose a new method to estimate the mixing matrix base on classification and counting the observed data. The experiment result shows that the new algorithm can not only simplify the calculation but also is easier to be understood. Besides, the new algorithm can provide a more accurate result according to the precision people wanted.
The International Journal of Engineering and Science (The IJES)theijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
This document summarizes a study that uses random matrix theory to model decoherence in a driven two-level quantum system coupled to a reservoir. The model varies parameters like the coupling strength between the system and reservoir, and the size of the reservoir. For weak coupling, the model shows Markovian decoherence consistent with the master equation. For strong coupling, non-exponential decay is observed, indicating non-Markovian dynamics. Increasing the reservoir size leads to faster decoherence and mixing of the system state. The random matrix theory approach naturally includes decoherence without adding it phenomenologically, and can model both Markovian and non-Markovian regimes of system-reservoir coupling.
Quantitative Evaluation of Dissociation Mechanisms in Methylorange and MethylredAI Publications
Several computational chemistry programs were evaluated as aids to teaching a part of qualitative analytical chemistry. Computational chemical calculations can predict absorption spectra, thus enabling the modeling of indicator dissociation mechanisms using a personal computer. An updated MNDO program among 51 programs was previously found to be the best predictor to explain the dissociation mechanisms of isobenzofuranones and sulfonephthaleins. Therefore, the further quantitative analysis was performed for methyl-orange and methyl-red. Computational chemical analysis can be used for quantitative explanation of indicator dissociation mechanisms.
Quantitative Evaluation of Dissociation Mechanisms in Methylorange and MethylredAI Publications
This document discusses using computational chemistry programs to quantitatively evaluate the dissociation mechanisms of the indicators methyl orange and methyl red. It finds that the MNDO program best predicts their absorption spectra and electron density maps. The study calculates the resonance structures and spectra of methyl orange and methyl red using different programs. It determines that combinations of MNDO with CI or ZINDO provide the best results for visualizing the color change mechanisms of these indicators. While improvements are still needed, computational chemistry can help teach qualitative analytical chemistry concepts in a quantitative way.
Spectroscopy chapter 9 textbook of organic chemistry arun bahl-Harem ahmed
(1) Infrared spectroscopy analyzes the absorption of infrared radiation by organic molecules. Different bonds and functional groups absorb at characteristic wavelengths.
(2) Ultraviolet-visible spectroscopy examines the absorption of UV and visible light, which causes electronic transitions in conjugated systems and carbonyl groups.
(3) Nuclear magnetic resonance spectroscopy analyzes the absorption of radio waves by atomic nuclei like hydrogen in a strong magnetic field. Signals are observed at characteristic chemical shifts depending on the chemical environment of nuclei.
(4) These three spectroscopic techniques revolutionized structure determination in organic chemistry by providing detailed information on molecular structure in a fast, accurate, and non-destructive manner.
Students analyzed an enediyne compound, C11H5O4, using computational chemistry methods like DFT and various spectroscopic techniques. The FT-NMR (1H and 13C) and FT-Raman spectra were obtained and compared to literature values. DFT calculations using B3LYP, MP2, and RHF methods helped students understand the vibrational modes, NMR chemical shifts, and frontier molecular orbitals like HOMO and LUMO of the compound. Experimental UV-Vis and FT-IR spectra were also collected and analyzed. The computational results provided insight into the structural properties and reactivity of this biologically relevant enediyne compound.
Quark Model Three Body Calculations for the Hypertriton Bound StateIOSR Journals
Hyperspherical three body calculations are performed to study and review the various properties of
the hypertriton bound state nucleus
3H in the quark model using -N potentials. In these calculations we study
the different effects of the -N potentials on the hypertriton bound states as well as the separation energy B. A
combination of realistic two body N-N potentials with various - N potentials are considered. Complete
symmetric and mixed symmetric wave functions are introduced. using the renormalized Numerov method. The
agreement between the calculated
3H binding energies and the available experimental data basically depends
on the type of the -N interactions used in the calculations. It was found that the -N potentials are the most
effective part in the hypertriton binding energy as well as the separation energy B where the -N potentials is
very effective to bound or unbound the
3H hyper nucleus
Pacs numbers: 21.30. + y, 21.10.+dr,27.20.+n
Tensammetric Analysis of Nonionic Surfactant Mixtures by Artificial Neural Ne...Fatemeh Sedaghatpour
1. An artificial neural network model was developed to analyze mixtures of four nonionic surfactants (Brij 30, 35, 56, and 96) using tensammetry.
2. Tensammetry measures the capacitive current of an electrode after surfactant adsorption. It was found to be sensitive for detecting the four Brij surfactants individually and in mixtures.
3. An artificial neural network was trained on tensammetry data from calibration mixtures to learn the relationships between peak currents and surfactant concentrations. It was then able to predict concentrations in new samples.
Antibacterial Activity of Schiff Bases Derived from OrthoDiaminocyclohexane, ...inventionjournals
Schiff bases (SBs) are known to possess many biological activities. In this paper we will be interested in nine SBs derived from ortho-diaminocyclohexane, meta-phenylenediamine, 1,6-diaminohexane and benzaldehydes variously substituted by nitro group. We had synthesized, characterized and tested these molecules for their antibacterial properties. Herein our study focuses in particular on the determination of quantum descriptors on which observed antibacterial activity depends, in order to be able to predict biological activities in analogue molecule series. Using quantum chemistry methods at B3LYP / 6-31G (d, p) level, we determined for each molecules, theoretical antibacterial potentials that we correlated to the experimental ones. Calculation results showed that, the energy of the Highest Occupied Molecular Orbital (EHOMO), electronegativity (χ) and electronic energy (E), are the best quantum descriptors related to the antibacterial activity values of studied molecules. The correlation coefficient R 2 indicates that 92.1% of the molecular descriptors defining this model are taken into account with a standard deviation of 0.152.The model significance is reflected by Fischer coefficient F = 7.721: Correlation coefficient of cross-validation = 0.88. This model is acceptable with . The values of the pCE50theo/pCE50exp values of the validation set tend to unity
The optimal synthesis of scanned linear antenna arrays IJECEIAES
In this paper, symmetric scanned linear antenna arrays are synthesized, in order to minimize the side lobe level of the radiation pattern. The feeding current amplitudes are considered as the optimization parameters. Newly proposed optimization algorithms are presented to achieve our target; Antlion Optimization (ALO) and a new hybrid algorithm. Three different examples are illustrated in this paper; 20, 26 and 30 elements scanned linear antenna array. The obtained results prove the effectiveness and the ability of the proposed algorithms to outperform and compete other algorithms like Symbiotic Organisms Search (SOS) and Firefly Algorithm (FA).
Colorimetry and atomic absorption spectroscopy O.P PARIHAR
This document describes the principles and methods of colorimetry and atomic absorption spectroscopy. Colorimetry involves using a colorimeter device to measure the absorbance of light by a solution, allowing determination of an unknown concentration through the Beer-Lambert law. It describes the key parts of a colorimeter and how it works. Atomic absorption spectroscopy uses atomic absorption of light to determine elemental concentrations. It outlines the basic components and principles of how atomic absorption spectrometers work to analyze samples.
MODELING THE CHLOROPHYLL-A FROM SEA SURFACE REFLECTANCE IN WEST AFRICA BY DEE...ijaia
Deep learning provide successful applications in many fields. Recently, machines learning are involved for oceans remote sensing applications. In this study, we use and compare about eight (8) deep learning estimators for retrieval of a mainly pigment of phytoplankton. Depending on the water case and the multiple instruments simultaneously observing the earth on a variety of platforms, several algorithm are used to estimate the chlolophyll-a from marine reflectance.By using a long-term multi-sensor time-series of satellite ocean-colour data, as MODIS, SeaWifs, VIIRS, MERIS, etc…, we make a unique deep network model able to establish a relationship between sea surface reflectance and chlorophyll-a from any measurement satellite sensor over West Africa. These data fusion take into account the bias between case water and instruments.We construct several chlorophyll-a concentration prediction deep learning based models, compare them and therefore use the best for our study. Results obtained for accuracy training and test are quite good. The mean absolute error are very low and vary between 0,07 to 0,13 mg/m3 .
MODELING THE CHLOROPHYLL-A FROM SEA SURFACE REFLECTANCE IN WEST AFRICA BY DEE...gerogepatton
Deep learning provide successful applications in many fields. Recently, machines learning are involved for oceans remote sensing applications. In this study, we use and compare about eight (8) deep learning estimators for retrieval of a mainly pigment of phytoplankton. Depending on the water case and the multiple instruments simultaneously observing the earth on a variety of platforms, several algorithm are used to estimate the chlolophyll-a from marine reflectance.By using a long-term multi-sensor time-series of satellite ocean-colour data, as MODIS, SeaWifs, VIIRS, MERIS, etc…, we make a unique deep network model able to establish a relationship between sea surface reflectance and chlorophyll-a from any measurement satellite sensor over West Africa. These data fusion take into account the bias between case water and instruments.We construct several chlorophyll-a concentration prediction deep learning based models, compare them and therefore use the best for our study. Results obtained for accuracy training and test are quite good. The mean absolute error are very low and vary between 0,07 to 0,13 mg/m
This document describes research into developing algorithms to identify volatile organic compounds (VOCs) using colorimetric sensor array data. Three identification methods were tested: 1) distinguishing reactive from non-reactive sensor spots, 2) calculating z-scores to find the closest chemical signature, and 3) measuring the angle between vector representations of signatures. The angle method correctly identified over 90% of 34 test chemicals, outperforming the other methods. However, some similar chemicals were still confused for each other. More testing is needed with larger datasets to improve consistency. Colorimetric sensor arrays show potential for applications like medical diagnostics if identification accuracy can be increased further.
Reduction - Oxidation Titrations Theory and Application.pptAbdelrhman abooda
This document discusses redox (oxidation-reduction) titrations. It begins by defining redox reactions and key terms like oxidizing agent and reducing agent. It then discusses oxidation numbers and how to calculate them. Several examples of oxidation numbers are provided. The document also covers balancing redox reactions using the half-reaction method. Factors that affect oxidation potential are explained, including common ions, pH, complexing agents, and precipitating agents. Standard reduction potentials of various redox couples are presented. Finally, the shape of a typical redox titration curve is briefly described.
The document discusses laboratory controls required by cGMP regulations. It provides an overview of Subpart I, which establishes requirements for laboratory controls, testing and release of products, stability testing, special testing, reserve samples, and laboratory animals. The document emphasizes that laboratory data is essential to prove manufacturing processes and products are suitable and ensure consistent product quality. It warns that unreliable test methods can pose risks to both consumers and manufacturers.
Cell injury occurs through various mechanisms including ATP depletion, generation of reactive oxygen species, loss of calcium homeostasis, plasma membrane defects, and mitochondrial damage. The type and severity of injury determines the cellular response. Cell function is lost before morphological changes appear, and the point at which cell death becomes irreversible is difficult to determine. Specific causes of cell injury include ischemia/hypoxia, free radicals, increased cytosolic calcium, plasma membrane permeability defects, and mitochondrial disruption.
Diabetes mellitus is a metabolic disorder characterized by hyperglycemia resulting from insulin deficiency or insulin resistance. There are four main types: type 1 caused by lack of insulin production; type 2 caused by insulin resistance; gestational diabetes during pregnancy; and other rare forms. Treatment involves lifestyle changes, oral medications like metformin, sulfonylureas, and thiazolidinediones, or insulin injections depending on the type and severity of diabetes. The goal is to control blood sugar levels and prevent complications.
Fetal growth disorders can result from placental insufficiency restricting nutrient transfer or abnormal fetal growth potential. Growth occurs through hyperplasia in early gestation and later hyperplasia with hypertrophy. Accurate dating and serial ultrasounds can detect abnormalities. Restricted growth increases risks of cardiac and renal issues after birth. Macrosomia increases risks of shoulder dystocia and maternal complications. Management aims to balance fetal and maternal risks, with elective delivery generally not advised before 39 weeks except for very large estimated fetal weights in diabetic mothers.
- Measles, mumps, and rubella are caused by viruses. Measles is caused by a paramyxovirus, mumps by a myxovirus, and rubella by a rubivirus.
- They are spread through respiratory droplets. Measles and mumps have an incubation period of 7-18 days, while rubella is 14-21 days.
- Common symptoms include fever, rash, and lymphadenopathy. Complications can include pneumonia, encephalitis and congenital rubella syndrome.
- Vaccines provide effective protection. MMR vaccine contains live attenuated viruses and is recommended in 2 doses for children.
This document discusses developing effective communication skills. It covers basic communication principles like ensuring the message is received clearly. It discusses the communication trilogy of giving and gathering good information and building trust. It also covers developing assertive communication skills, active listening skills, and handling feedback and criticism constructively. The overall message is that effective communication is key to building productive relationships and avoiding issues like reduced productivity or damaged reputations.
The document describes the early development of the heart in an embryo. It begins with angiogenic cell clusters in the cardiogenic area that form endocardial tubes on day 19. These tubes fuse to form a single endocardial tube by day 21. The tube develops constrictions that outline the bulbus cordis, truncus arteriosus, primitive ventricle, and primitive atria. By day 22, the heart starts beating ineffectively. Circulation begins between days 27-29 as the heart further develops structures like the atrioventricular canal. The document provides detailed information on heart development from approximately days 16-40 of embryogenesis.
Voltammetry involves applying a time-dependent potential to an electrochemical cell and measuring the resulting current. A voltammogram plots current versus applied potential. Polarography is a type of voltammetry that uses a dropping mercury electrode (DME). With a DME, the potential is measured versus a reference electrode as the mercury drop grows. Current results from redox reactions and is influenced by mass transport and electron transfer kinetics. Non-faradaic currents also occur due to charging of the electrical double layer. A polarogram shows the characteristic diffusion-limited current when sufficient overpotential is applied for an analyte's reduction.
This document discusses several topics related to the autonomic nervous system and neuromuscular junction. It describes the uses and mechanisms of action of antimuscarinic agents like scopolamine and ipratropium, ganglionic blockers, neuromuscular blockers, and their drug interactions. Specifically, it notes that scopolamine is useful for preventing motion sickness and ipratropium is used for asthma. It also explains that neuromuscular blockers relax skeletal muscles and are used for surgery and convulsions, acting by blocking nicotinic receptors.
The autonomic nervous system is divided into the sympathetic and parasympathetic divisions. The sympathetic division is responsible for the "fight or flight" response and uses norepinephrine as its main neurotransmitter. It works through activation of adrenergic receptors. The parasympathetic division elicits the "rest and digest" response and uses acetylcholine as its primary neurotransmitter, which acts through nicotinic and muscarinic receptors. Both divisions contain a two-neuron chain, with the first neuron being preganglionic and the second being postganglionic. The autonomic nervous system helps regulate the function of organ systems through its effects on tissues like cardiac muscle, smooth muscle and glands.
Musculoskeletal disorders (MSDs) are injuries or disorders of the muscles, nerves, tendons, joints, and spinal discs that can develop over time from repetitive or forceful manual tasks. MSDs are a major cause of occupational injuries, accounting for over 30% of cases. They place a significant burden on individuals and economies, with total annual costs in the billions of dollars. Common work-related MSDs affect the hands, wrists, elbows, shoulders, and neck. Ergonomic prevention focuses on engineering solutions like workstation design, tools, and job methods to reduce physical risk factors associated with MSDs like force, repetition, posture, and vibration.
This document discusses percutaneous absorption, which is the absorption of drugs through the skin. It describes the structure of skin, which consists of the epidermis and dermis layers. Percutaneous absorption involves drugs diffusing through the stratum corneum barrier and into the skin microcirculation. The rate of absorption is affected by factors like the drug's physicochemical properties, skin conditions, and techniques used to enhance delivery like hydration, ultrasound, or chemical enhancers. The goal is to maximize bioavailability by overcoming the stratum corneum barrier through various approaches.
Are you looking for a long-lasting solution to your missing tooth?
Dental implants are the most common type of method for replacing the missing tooth. Unlike dentures or bridges, implants are surgically placed in the jawbone. In layman’s terms, a dental implant is similar to the natural root of the tooth. It offers a stable foundation for the artificial tooth giving it the look, feel, and function similar to the natural tooth.
Histololgy of Female Reproductive System.pptxAyeshaZaid1
Dive into an in-depth exploration of the histological structure of female reproductive system with this comprehensive lecture. Presented by Dr. Ayesha Irfan, Assistant Professor of Anatomy, this presentation covers the Gross anatomy and functional histology of the female reproductive organs. Ideal for students, educators, and anyone interested in medical science, this lecture provides clear explanations, detailed diagrams, and valuable insights into female reproductive system. Enhance your knowledge and understanding of this essential aspect of human biology.
Travel Clinic Cardiff: Health Advice for International TravelersNX Healthcare
Travel Clinic Cardiff offers comprehensive travel health services, including vaccinations, travel advice, and preventive care for international travelers. Our expert team ensures you are well-prepared and protected for your journey, providing personalized consultations tailored to your destination. Conveniently located in Cardiff, we help you travel with confidence and peace of mind. Visit us: www.nxhealthcare.co.uk
Osvaldo Bernardo Muchanga-GASTROINTESTINAL INFECTIONS AND GASTRITIS-2024.pdfOsvaldo Bernardo Muchanga
GASTROINTESTINAL INFECTIONS AND GASTRITIS
Osvaldo Bernardo Muchanga
Gastrointestinal Infections
GASTROINTESTINAL INFECTIONS result from the ingestion of pathogens that cause infections at the level of this tract, generally being transmitted by food, water and hands contaminated by microorganisms such as E. coli, Salmonella, Shigella, Vibrio cholerae, Campylobacter, Staphylococcus, Rotavirus among others that are generally contained in feces, thus configuring a FECAL-ORAL type of transmission.
Among the factors that lead to the occurrence of gastrointestinal infections are the hygienic and sanitary deficiencies that characterize our markets and other places where raw or cooked food is sold, poor environmental sanitation in communities, deficiencies in water treatment (or in the process of its plumbing), risky hygienic-sanitary habits (not washing hands after major and/or minor needs), among others.
These are generally consequences (signs and symptoms) resulting from gastrointestinal infections: diarrhea, vomiting, fever and malaise, among others.
The treatment consists of replacing lost liquids and electrolytes (drinking drinking water and other recommended liquids, including consumption of juicy fruits such as papayas, apples, pears, among others that contain water in their composition).
To prevent this, it is necessary to promote health education, improve the hygienic-sanitary conditions of markets and communities in general as a way of promoting, preserving and prolonging PUBLIC HEALTH.
Gastritis and Gastric Health
Gastric Health is one of the most relevant concerns in human health, with gastrointestinal infections being among the main illnesses that affect humans.
Among gastric problems, we have GASTRITIS AND GASTRIC ULCERS as the main public health problems. Gastritis and gastric ulcers normally result from inflammation and corrosion of the walls of the stomach (gastric mucosa) and are generally associated (caused) by the bacterium Helicobacter pylor, which, according to the literature, this bacterium settles on these walls (of the stomach) and starts to release urease that ends up altering the normal pH of the stomach (acid), which leads to inflammation and corrosion of the mucous membranes and consequent gastritis or ulcers, respectively.
In addition to bacterial infections, gastritis and gastric ulcers are associated with several factors, with emphasis on prolonged fasting, chemical substances including drugs, alcohol, foods with strong seasonings including chilli, which ends up causing inflammation of the stomach walls and/or corrosion. of the same, resulting in the appearance of wounds and consequent gastritis or ulcers, respectively.
Among patients with gastritis and/or ulcers, one of the dilemmas is associated with the foods to consume in order to minimize the sensation of pain and discomfort.
Pictorial and detailed description of patellar instability with sign and symptoms and how to diagnose , what investigations you should go with and how to approach with treatment options . I have presented this slide in my 2nd year junior residency in orthopedics at LLRM medical college Meerut and got good reviews for it
After getting it read you will definitely understand the topic.
These lecture slides, by Dr Sidra Arshad, offer a simplified look into the mechanisms involved in the regulation of respiration:
Learning objectives:
1. Describe the organisation of respiratory center
2. Describe the nervous control of inspiration and respiratory rhythm
3. Describe the functions of the dorsal and respiratory groups of neurons
4. Describe the influences of the Pneumotaxic and Apneustic centers
5. Explain the role of Hering-Breur inflation reflex in regulation of inspiration
6. Explain the role of central chemoreceptors in regulation of respiration
7. Explain the role of peripheral chemoreceptors in regulation of respiration
8. Explain the regulation of respiration during exercise
9. Integrate the respiratory regulatory mechanisms
10. Describe the Cheyne-Stokes breathing
Study Resources:
1. Chapter 42, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 36, Ganong’s Review of Medical Physiology, 26th edition
3. Chapter 13, Human Physiology by Lauralee Sherwood, 9th edition
“Psychiatry and the Humanities”: An Innovative Course at the University of Mo...Université de Montréal
“Psychiatry and the Humanities”: An Innovative Course at the University of Montreal Expanding the medical model to embrace the humanities. Link: https://www.psychiatrictimes.com/view/-psychiatry-and-the-humanities-an-innovative-course-at-the-university-of-montreal
Travel vaccination in Manchester offers comprehensive immunization services for individuals planning international trips. Expert healthcare providers administer vaccines tailored to your destination, ensuring you stay protected against various diseases. Conveniently located clinics and flexible appointment options make it easy to get the necessary shots before your journey. Stay healthy and travel with confidence by getting vaccinated in Manchester. Visit us: www.nxhealthcare.co.uk
- Video recording of this lecture in English language: https://youtu.be/Pt1nA32sdHQ
- Video recording of this lecture in Arabic language: https://youtu.be/uFdc9F0rlP0
- Link to download the book free: https://nephrotube.blogspot.com/p/nephrotube-nephrology-books.html
- Link to NephroTube website: www.NephroTube.com
- Link to NephroTube social media accounts: https://nephrotube.blogspot.com/p/join-nephrotube-on-social-media.html
NAVIGATING THE HORIZONS OF TIME LAPSE EMBRYO MONITORING.pdfRahul Sen
Time-lapse embryo monitoring is an advanced imaging technique used in IVF to continuously observe embryo development. It captures high-resolution images at regular intervals, allowing embryologists to select the most viable embryos for transfer based on detailed growth patterns. This technology enhances embryo selection, potentially increasing pregnancy success rates.
NAVIGATING THE HORIZONS OF TIME LAPSE EMBRYO MONITORING.pdf
273a318
1. The spectrophotometric analysis of mixtures with overlapping
absorption bands
J. SUSTEK
Research Instititte of Agrochemical Technology,
810 04 Bratislava
Received 16 March 1972
Accepted for publication 17 July 1972
The subject of this work was to estimate the precision and accuracy of the
results of the determination of the individual component concentrations
in their mixtures obtained by four absorption spectroscopic methods.
The spectrum of any substance can be expressed by a linear combination
or by a product of Lorentz or Gauss functions; therefore the spectrum
approximated by two overlapping Lorentz functions was used as the
model system. Small concentrations of unknown components were re
placed by a polynomial.
Provided that the La mb er t - Beer law and the law of the additivity of components
absorbances are valid, t he relationship between concentrations of the individual com
ponents and absorbance at analytical wavenumbers can be expressed in matrix no.ta
tion [I]
a = l( x c , (I)
where a - the column matrix c.f absorbances at wavenumbers g = l, 2, . .. , k,
K - the matrix of absorptivities ku1 of the components j = 1, 2, . . . , n at wa·e-
numbers g = 1, 2, . . . , k (matrix of the k x n type),
c - the column matrix of concentrations of the components j = 1, 2, . . . , n.
In the simplest case, when k = n, one wavenumber, usually corresponding to t he
maximum of an absorption band, is chosen for each component. Equation (J) t.lien
represents a system of n linear equations with n unknown concentrations at n different.
wavelengths.
The absorptivities k01 can be found as follows. Series of solutions of the individual
components are prepared, absorbances on their spectra are measured and then the line
i,;Jopes of the dependences of absorbances on concentration are estimated graphically
or calculated by the least-squares method [I, 2). In a favourable case when the spectrn
of the components do not overlap too much, the main diagonal elements of the matrix
of absorptivities are relatively large in comparison with other elements. The system
of equations represented by equation (J) can be solved by some common methods [3].
When the absorption bands of the individual components overlap to a large extent.,
this classical method is not efficient enough and the determined concentrations of com
ponents are imprecise and often inaccurate. Better results can be obtained by mean;;:
of overdetermined systems of equations together with the least-squares method. An o,·er
<letermined system of equations can be chosen by two different ways:
318 Cltein. zvtsti 21 (3) 318-:-326 (1973)
2. SPECTUOPHOTQ)lETRIC ANALYSIS OF ;IlXTUR ES
I . The mat rix K is obtained as described above, using the spectra of indi,·idual :
<;tan
dards, but t he absorbances are measured at more wavelengths (wavenumbers) t han
is the number of components [I, 4 - 7 ] . After Zscheile and co-·workers [8] the best res1ilts
are achie,·ed if maximum of the accessible wavelengths is used and the same ·as C(ln
cluded by Sternberg et al. [9]. Such method was applied by many ant.hors especinl ly
in the ultraviolet region where absorption bands are relatively broad and the precision
of the measurement of absorbances is high. Thus, reproducible measurements are possihle
there even at the sides of absorption bands.
2. Barnett and Bartoli [10] used the spectra of mixtures of the standards for calibrat.ion
instead of the individual standards, the number of calibration mixtures being grent.e1·
than the number of the components. The number of analytical wavelengths is eq ual
to the number of components. Niebergall and :
M attocks [ II] applied a similar procedu.-e
in the ultraviolet region. Absorbances were measured at the maximum of the ban<l
of each component. Such procedure removes problems occurring especially in the infrm-e1l
region. A number of the specific absorption bands for each component are usually avai 1-
able there but the Lambert - B e e r law is often not valid exactly and measurement.s
of absorbances at sharply sloped parts of absorption bands are not precise.
Vasilyet' [12] extended the validity of Barnett's and Bartoli's relationships for any
number of wavenumbers and expressed them in matrix notation. In other works [ 1 3 - Hi]
the generalization of the method of the analysis of multicomponent mixtures has been
theoretically worked out and practical application in u.v. and i.r. regions pointed ou t.
The method joins the advantages of the overdetermined system of equations ii1 the
number of calibration mixtures with those of overdetermination in analytical 'nve
numbers.
The aim of the present work is to compare the accuracy and precision of the above-crto<l
methods in relation to the extent of overlapping of absorption bands and to check t.lw
possibility of determination of the individual components from absorbances measu red.
at the sides of absorption bands in the infrared region.
Experimental
Precision and accuracy of the results of determination of the component concentrations
in the mixtures obtained by the methods chosen were studied on a model system and
verified on the binary mixture of chlorobenzene with o-dichlorobenzene. Two ov0rlapping
absorption bands were used as the model system which enabled to check the ' influence
of experimental errors on the determination of concentrations in a multicomponent.
mixture. Each band was expressed by the Lorentz function [16, 17]
A; = - - - Ao
- - -
-
4(ii - iio)2
I + - - - -
Lliir12
(
2)
where A ;
Ao
iio
- absorbance at frequency ii,
- absorbance at frequency iio,
- frequency at the maximum of the band,
.Jii11
2 - half-band width.
The influence of background [18, 19] causing deviations from the Lambert - B e e l·
law was approximated by the function
(lllem. Zt't8ti 27 (3) 318 - 3 2 6 (lj)73)
319
3. J. Sl'STEK
A;;(obs) = a( r - 1
•02) 2 - {
:
J
(1
' - vo2) + ? , (3)
where iio2 is the frequency at t he maximum of the second band. The coefficients °'•{J, J'
were estimated from the spectra of chlorobenzene and o-dichlorobenzene. Another
inaccuracy was brought in the model system by rounding off the values of A; to three
decimal places (which corresponded to the common precision of measured absorbances).
Numerical ,·alues representing the concentrations of the components in the calibration
solutions of standards. in the calibration mixtures and samples, as well as other para
meters were chosen to be similar to the parameters of the binary system chlorobenzene -
-o-dichlorobenzene, used in the infrared region (Ta ble 1).
Table 1
Compa rison of the model and expe1·imental parameters of the binary system
Lorentz functions
j = l j = 2
Chloro
benzene
j = l
o- Dichloro
benzene
j = 2
Parameter
iio [cm-1]
Region of spectrum [cm-']
Distances of maxima
Lliio = iio1 - iio2 [cm-I]
Distances of analytical wavenumbers
Llii = ii9 - 1
•9-1 [cm-1]
2.0 10.0
0 -1 2 . 0
8.0
737.6 746.2
Cma..x [% w/v] 0.5000 0.5000 0.4920 0.5030
Ao 0.750 0.550 0.714 0.551
Llii112 [cm-1] 4.0 4.5 5.7 5.3
735.4-748.4
/
8.72
2.0 2.18
.Model samples
The abso1·ba nces of model samples were calculated by t he same way as t he absorbances
of components of the binary model system. The matrices Bof ten chosen samples (m = 10;
1.:= 2 and 1.: = 7) were calculated to compare different methods. Total concent ration
of samples did not exceed the inten·al of 0.4952 - 0 . 5 0 2 5 0 w/v while the concentration
ratio of t he two components was always 0.2585 : 0.2415.
Binary system chlorobenzene -o-dichlorobenzene
The selected methods of the spect rophotometric analysis of mult icomponent mixtures
were applied to determine the mixt ure of chlorobenzene with o-dichlorobenzene in the
infrared region (720-760 cm- 1). MeastU'ements were perfonned on a double.beam
UNICAM SP-100 infrared spectrophotometer (NaCl prism) using 1-mm cells with NaCl
windows.
Standard solutions and calibrat ion mixttu·
es were prepared from the standards of the
individual components; redistilled carbon disulfide was used as a soln·nt. The concentra
tions of the standard solutions of chlorobenzene and o-dichlorobenzene ,·aried from
0.05 to 0.5% w/v. The concentration of chlorobenzene in calibl'ation mixtmes decreased
from 0.5111% w/v in the 1st mixture to 0% in the 21st one. The concentration of o-di
chlorobenzene was chosen so as to make the total sum of concent rations (cil + c;2)
equal to ca. 0.5000% w/·. The values of absorbances used for calculation of the calibra
tion data we1·e corrected for the solvent absorbances.
3 20 Che-111. zvesti 27 (3) 318-326 (1973)
4. SPECTROPHOTOMETRIC ANALYSIS OF MIXTURES
J
.lethods of calibration and calculations of the sample concentrations
M ethod I
The calibration data were calculated from the known concentrations of the solutions
of the individual standards and from the absorbances measured at the maxima of the
corresponding bands (wavenumbers 2 and 6). The arithmetic series of seven concentrations
t.aken from the interval of 0.07-0.5 % w/v was used. k9 1 and k g 2 were calculated by
minimalization of deviations from the Lambert - Beer law via the least-squares method
= =
[I, 2, 15]; the resulting matrix K was inverted to K - 1 •
The unknown concentrations of components in the samples were calculated by multi
plication of the transposed matrix x-1 by the matrix of the sample absorbances 'B
which were measured at wavenumbers 2 and 6 of the spectra of samples. The formula is
X = (J( - 1)T x B , (
4)
where X - the matrix of concentrations of the component.s j = l, 2, . . . , n in the samples
i = l, 2, . . . , m (type n x m),
B - the matrix of absorbances of the samples i = l, 2, . . . , m at waYenumbers
g = I, 2, .. . , k (t.ype k x m).
Method II
The matrix of absorptivities K ·was evaluated in the same way as in method I but
absorbances were measured also at the sides of the absorption bands (k = 7). The result
ing matrix ]( is a rectangular one, its inverse matrix is not defined. The required con
centrations of samples can be calculated by minimalization of the squares of absorbance
deviations with respect to concentrations [ l, 15, 20]
X = Q X B , (5)
where Q is the matrix (type n x k) for calculation of concentrations
Q = (KT x K ) - 1 x KT (5a)
Method I l l
The calibration data were obtained here by measurements of m = 21 mixtures of the
known composition. Concentrations of the first component decreased regularly from
0.5000% w/v in the lst mixture to 0% w/v in the 21st one while concentrations of the
second component increased at the same time from 0% to 0.5000% w/v. The total con
centration in any mixture was always 0.5000% w/v. The absorbances were measured
at two wavenumbers corresponding to the maxima of absorption bands of components .
The values obtained were arranged to form the matrix of concentrations C and the
matrix of absorbances A. Multiplying these matrices after equation (6) we can obtain
directly the matrix for calculation of concentrations [15]
Q = 0 X QT X (A X Q T )-1 , (
6)
where C - the matrix of concentrations of the components j = I , 2, . . . , n in the mixtures
i = 1, 2, .. ., m (type n x m),
Chem. zvesti 27 (3) 318-326 (1973)
5. A - the matrix of absorbances of the mixtures i = I , 2, .. . , m at wavenumberil
g = l , 2, . . . , k (type k X m).
The concentrations of components in the samples were calculated after equation (5).
3Iethod IV
The calibration data were calculated from absorbances obtained as in method I I I
supplemented by absorbances measured at the sides of absorg tion bands (k = 7) of ca
libration mixtures composed as in method I I I . The matrix Q was calculated after the
following formula, derived for the case k > n [15]
- - - = -
Q = c x CT x (C x AT x A x CT)-l x c x AT (6a)
The concentrations of components in the samples were again calculated afoer equa
tion (5).
uethod V
The matrix Q was calculated in the same way as in method I V but instead of tho
matrices C and A (m = 21) their submatrices (m = 7, mixtures 8 - 1 4 ) were used. !"or the
calculation of the concentrations of components equation (5) was used.
Remarks
Other two model systems and model samples were studied to compare the efficiency
of methods I - V in dependence on the extent of overlapping of the absorption bandil.
The distances of maxima of two Lorentz bands were 4.0 cm-1 (iio1 = 4 cm-1 , iio2 =
= 8 cm-1) and 12.0 cm-1 (iio1 = 0 cm-1, iio2 = 12 cm-1) , respectively. The other para
meters were the same as it was with a maxima distance of 8.0 cm-1 .
A desk calculator ELKA 6521 was used for the calculations of methods I and I I
and a digital computer GIER (Regnecentralen) for the methods I II , I V, and V. The
computer programme was written in ALGOL; version GIER-ALGOL 4 [21].
Results and discussion
The accuracy of results of the above-listed methods was compared by means of the
relative errors of concentration determinations L
I
<
%
>Ji , calculated from the formula
(7)
where c11 - the known concentration of the component j = l, 2, . . . , n in the sample
i = l, 2, . . . , m,
x11 - the determined concentration of the component j = 1, 2, . . . , n in the sample
i = 1, 2, . . . , m.
The criteria of precision of the achieved results were standard deviations of the con
centration determinations of components from their known values
SJ =
V
- - - - - - ,
m
i l (XJi - CJ1)
2
(S)
where m is the number of determinations.
322 Cheni. zveati 21 (3) 318-326 (1973)
7. J. St:sTEK
Table 3
A·erages of the absolute Yalues of relative errors of the determination
of component concentrations by met.hods I - V
Com-
po-
nent
j
L
fr°'.J i [%]
System
Chlorobenzene-o-dichlorobenzene
Model system .d
V
"o = 8 cm-1
:Model system .dV'o = 4 cm-1
)fodel system Lliio = 12 cm-1
1
2
1
2
1
2
1
2
Table 4
Standard deYiations of the concentration determinations of components
by methods I - V
Com-
po-
nent
j
BJ• 103 [% w/v]
System
Chlorobenzene-o-dichlorobenzene
:Model system .dv0 = 8 cm-1
Model system .dvo = 4 cm-1
Model system .dvo = 12 cm-1
1
2
1
2
1
2
1
2
Table 2 shows the known concentrations of chlorobenzene (the component J) and
o-dichlorobenzene (the component 2) in the mixtures 1 - 2 1 and the concentrations
determined by methods I - V. The results of method V were calculated by means of the
submatrices i = 1 - 7 , 8 - 1 4 , 1 5 - 2 1 . The averages of absolute values of relative errors
of the concentration determinations L
r
<
%
>1 are shown in Table 3, standard deviations
of the concentration determinations BJ are in Table 4.
The accuracy and precision of the cbtermination of the binary mixture chlorobenzene
- o-dichlorobenzcnc were appreciably higher in methods I I I - V where calibration was
made by mixtures. However, an independent set of data was used for calibration in
methods I and I I (calibration by the individual standards) while a regressive calculation
of concentrations of the calibration mixtures was, in fact, performed in methods I I I - V.
The increase in wavenumbers resulted in a decrease of the precision and accuracy of de
terminations, obviously due to the errors of absorbances measured at the sides of the
absorption bands.
As follows from the L
r
<
%
>1 and SJ values of the model system (the distance of maxima
324 Chem. zvesti 27 (3) 318 - 3 2 6 (1!>73)
I
6.034
II
7.082
II I
3.833
IV
4.225
v
1.944
4.422 5.041 3.251 6.684 3.084
2.307 1.364 0.548 0.520 0.346
1.449 0.424 0.458 0.387 0.374
4.395 1.281 0.436 0.510 0.346
7.058 0.480 0.374 0.361 0.361
1.095 0.245 0.224 0.224 0.300
1.296 0.787 0.469 0.412 0.400
I II III IV v
4.1444 4.9862 1.3036 1.5388 1.0992
2.5086 3.2443 1.2164 1.4401 1.6623
0.8830 0.5151 0.1740 0.1702 0.1083
0.5886 0.1370 0.1578 0.1287 0.1204
1.7010 0.4881 0.1510 0.1782 0.1084
2.9238 0.1742 0.1203 0.1244 0.1285
0.4184 0.0736 0.0697 0.0580 0.0968
0.5095 0.2982 0.1614 0.1490 0.1448
8. SPECTROPHOTOMETRIC ANALYSIS OF :IIXTURES
8 cm-I ) , the accuracy and precision of determinations increase in accordance with the
sequence of the listed methods. The increase in wavenumbers has a clean-cut influence
only on the calibration by individual standards.
The results achieved in both cases by method F proved that the nanowed concentra
tion range of calibration mixtures may improve precision and accuracy, even when
a markedly lower number of calibrat.ion mixtures was used.
An influence of t.he overlapping of absorption bands on the precision and accuracy
of determinations can be deduced from a comparison of the results for all model systems.
When overlapping is larger (.d iio = 4 cm-1 ) , the calibrat.ion by mixtures is more advan
tageous while the increase in wavenumbers influences only the calibration by individual
standards. Smaller overlapping (.1vo = 12 cm - 1 ) brings about a slight improvement
of precision and accuracy, parallel to the sequence of the above methods. Markedly
improved are only the results of method I , which are the least precise and accurate .
On the basis of the achieved results it can be concluded that calibration by mixtures
increases substantially the precision and accuracy of the analysis of mixtm·es with
overlapping absorption bands. Furthermore, even the absorbances measured at the sides
of overlapping absorption bands can be used in the systems overdetermined in wave
numbers (k > n) if they are measured with sufficient precision. This can be reached
g.by means of a spectrophotometer with a digital recorder of absorbances measured at
a great nw11ber of wavenumbers. The obtained values are processed by mathematical
filtration in a computer [22). An optimalization procedure is applied to choose the optimal
analytical wavenurnbers and the corresponding absorbances are used for calculation
of calibration data or concentrations of components in the samples.
Acknowled gements. The authw is indebted to Dr JI. Li1•ar , Institute of Chemistry, Ko
mensky Unfrersit y , Bratislava and to Dr 0 . Schiess[ , Research Institute of Wood, Bratislai•a
for their helpful w m m nts and for p1·aL"'iding us with their programmes.
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Trunslatecl by F. Kopecky
326 Chem. zveilti 27 (3) 316 -326 (1973)