This document presents information on analyzing organophosphorus and organochlorine pesticides. It describes the effects of pests and insects on various foods, the history of pesticide use in agriculture, and provides details on multi-residue methods for determining these pesticides. The methods involve extracting samples using solvents like acetone and dichloromethane, clean up using chromatography columns, and analyzing extracts using gas chromatography with detectors like FPD or ECD. Calibration is done against standard solutions to quantify residues in samples.
Effects of pest and insects on various food, use of
pesticides in agriculture, pesticide cycle, organophosphorus and
organochlorine pesticides analysis, determination of pesticide residues in grain, fruits, vegetables, milk and milk products.
In this slides contains classification, mechanism of action, Pesticide Used in Agriculture and Quantification of Organophosphorus Pesticide.(food analysis).
Presented by: P. Naresh (Department of pharmaceutical analysis),
RIPER, anantapur.
Effects of pest and insects on various food, use of
pesticides in agriculture, pesticide cycle, organophosphorus and
organochlorine pesticides analysis, determination of pesticide residues in grain, fruits, vegetables, milk and milk products.
In this slides contains classification, mechanism of action, Pesticide Used in Agriculture and Quantification of Organophosphorus Pesticide.(food analysis).
Presented by: P. Naresh (Department of pharmaceutical analysis),
RIPER, anantapur.
In this slide contains Methods of Detection of Natural, Permitted and Non Permitted Dyes.
Presented by: P.SUDHEER KUMAR (Department of pharmaceutical analysis).
RIPER, anantapur
In this slide I have given brief knowledge about types of preservatives. This slide is recommended to students who are new to this particular topic or those who want notes for examination. I hope you will get benefit from this slide. Do comment for any improvement or want slides that i should prepare for you.
In this slide contains pesticide used in grains, limits as per FSSAI , general detection method for pesticide in Grains and extraction procedures.
Presented by: P.Pavan Kalyan. (Department of pharmaceutical analysis).
RIPER, anantapur.
In this slides contains deep introduction about pesticides and analysis of pesticide residue in vegetables.
Presented by: M. Malarvannan (Department of pharmaceutical analysis),
RIPER, anantapur.
In this slide contains adulteration, milk standards, sample preparation, identification of adulterants and contamination of milk.
Presented by: G.Sateesh Chandra (Department of pharmaceutical analysis).RIPER, anantapur
University Institute of Pharmaceutical Sciences is a flag bearer of excellence in Pharmaceutical education and research in the country. Here is another initiative to make study material available to everyone worldwide. Based on the new PCI guidelines and syllabus here we have a presentation dealing with basics impurity profiling and degradent characterization.
Thank you for reading.
Hope it was of help to you.
UIPS,PU team
In this slide contains need of food regulations, system and Legislation Regulation of Food Products as per BSI and Agmark.
Presented by: G. Chiranjeevi (Department of pharmaceutical analysis),
RIPER, anantapur.
As we all know chromatographic fingerprinting of botanicals is a quite recent concept. This presentation will help to the beginners to understand basic thories and fundamantals of thin layer chomatography. The presentation will also provide basic experiemental understanding to perfrom HPTLC fingerprinting of samples/extracts/formulations.
In this slide contains definition and biological assay of Adsorbed Diphtheria Vaccine.
Presented by: G.CHIRANJEEVI (Department of pharmaceutical analysis).
RIPER, anantapur
In this slide contains Methods of Detection of Natural, Permitted and Non Permitted Dyes.
Presented by: P.SUDHEER KUMAR (Department of pharmaceutical analysis).
RIPER, anantapur
In this slide I have given brief knowledge about types of preservatives. This slide is recommended to students who are new to this particular topic or those who want notes for examination. I hope you will get benefit from this slide. Do comment for any improvement or want slides that i should prepare for you.
In this slide contains pesticide used in grains, limits as per FSSAI , general detection method for pesticide in Grains and extraction procedures.
Presented by: P.Pavan Kalyan. (Department of pharmaceutical analysis).
RIPER, anantapur.
In this slides contains deep introduction about pesticides and analysis of pesticide residue in vegetables.
Presented by: M. Malarvannan (Department of pharmaceutical analysis),
RIPER, anantapur.
In this slide contains adulteration, milk standards, sample preparation, identification of adulterants and contamination of milk.
Presented by: G.Sateesh Chandra (Department of pharmaceutical analysis).RIPER, anantapur
University Institute of Pharmaceutical Sciences is a flag bearer of excellence in Pharmaceutical education and research in the country. Here is another initiative to make study material available to everyone worldwide. Based on the new PCI guidelines and syllabus here we have a presentation dealing with basics impurity profiling and degradent characterization.
Thank you for reading.
Hope it was of help to you.
UIPS,PU team
In this slide contains need of food regulations, system and Legislation Regulation of Food Products as per BSI and Agmark.
Presented by: G. Chiranjeevi (Department of pharmaceutical analysis),
RIPER, anantapur.
As we all know chromatographic fingerprinting of botanicals is a quite recent concept. This presentation will help to the beginners to understand basic thories and fundamantals of thin layer chomatography. The presentation will also provide basic experiemental understanding to perfrom HPTLC fingerprinting of samples/extracts/formulations.
In this slide contains definition and biological assay of Adsorbed Diphtheria Vaccine.
Presented by: G.CHIRANJEEVI (Department of pharmaceutical analysis).
RIPER, anantapur
In order to clean up soils contaminated with hydrocarbons, the bioremediation activity of Pseudomonas putida was studied. Pseudomonas putida is a bacterium that can withstand the harshest environmental conditions. It is able to metabolize a wide range of petroleum hydrocarbons which is used as a source of carbon and energy. Given the potential of this microorganism, an experiment wasconducted on this strain.
For the isolation of this microorganism, a sample ofsoil from the Vakinankaratra region in the urban commune of Antsirabe II, Madagascar was microbiologically analysed. The bacterial identification was based on a study of the morphological, physicochemical and sequential analysis of the 16S rDNA gene.
Fractionation of Crude Dye Extracted From Cucurbita Pepo Leaves by Cold Extra...journal ijrtem
ABSTRACT: Natural dyes are those dyes obtained from natural sources. The majority of natural dyes are usually collected from roots, berries, bark, leaves, wood, fungi and lichens. Usually in ancient days people have dyed their textiles by using locally available materials. Cold extraction for crude dyes extraction from Cucurbita pepo leaves. Theextract obtained quantitatively from cold extraction method was 6.81g and 2.27g respectively from 100g and 50g of C. pepo dry mass taken in 750ml and 500ml of ethanol solvent.6 components/functional groups were confirmed in crude dye fractioned with n hexane, chloroform and ethyl acetate but only 4 components/functional groups were confirmed in crude dye fractioned with acetone
Sterility testing products (solids, liquids, ophthalmic and other sterile pro...Ms. Pooja Bhandare
PHARMACEUTICAL MICROBIOLOGY (BP303T)Unit-IIIPart-6 Sterility testing products (solids, liquids, ophthalmic and other sterile products) according to IP, BP, USP.
Introduction: Test for Sterility. Culture Media. Fluid Thioglycollate Medium (FTM).
Alternative Thioglycollate Medium (ATM).
Soybean Casein Digest Medium (SCDM).
Tests for Culture Media:
Sterility of Media.
Growth Promotion Test.
Test for Bacteriostatic and Fungistatic.
Sterility Test Methods. Methods A: Membrane Filtration.
Method B: Direct Inoculation Pyrogen Test Methods. Rabbit Test. LAL Test.
A yeast strain E2 was purified from traditional yeast, and retained for its strongly acidifying, fermentative and saccharolytic
power. In fact, this strain produces a high concentration of acetic acid 105.85 mg / L revealed by using the H.P.L.C DAD technique
during its growth in semi synthetic medium containing sucrose at 5 g /l as only carbon source. The pH of the culture medium increases
from 5.58 to 2.76 after 24 hours of culture and to 2.48 after 48 hours of
Clinical Pathology Laboratory Report by Kula Jilo 2016kula jilo
Clinical pathology is a subspecialty of pathology that deals with the use of laboratory methods (clinical chemistry, microbiology, hematology and emerging subspecialties such as molecular diagnostics) for the diagnosis and treatment of disease. Hematology studies the blood and blood-forming tissues to evaluate presence of disease and assist in therapeutic interventions as clinically indicated. Clinical chemistry (also known as chemical pathology and clinical biochemistry) is the area of clinical pathology that is generally concerned with analysis of bodily fluids. Some of the objectives of this manual are to identify the most important hematological and functional pathological tests of vet importance, to diagnose different animal diseases by confirming the pathological causes that constraint livestock production and to have knowledge more about clinical pathology. Part one discusses about hematology which includes equipment’s and reagents, blood collection sites and procedures, preparation method for working solution, staining methods (staining procedures), hemoglobin determination, hematocrit determination (PCV), total RBC count, total WBC count, differential leukocyte count, determination of ESR, coagulation time determination, bleeding time, calculating red blood cell indices and blood group and Rh factor determination. Part two deals with function tests which includes determination of Aspartate Amino Trasferase (AST) and Glutamic OxalacetateTransminase (GOT), determination of Alkaline Phosphtase (ALP), determination of creatinine, total protein determination, urea determination, total and direct bilirubin determination, enzymatic kinetic colorimeter test, liver function test, kidney function test, rumen function test and pancreatic function test. In general, the outline of this laboratory manual deals with the basic hematological procedures and clinical chemistry analysis.
Notes* for the subject 'Advanced Pharmaceutical Analysis'Sanathoiba Singha
As per the syllabus prescribed by Rajiv Gandhi University of Health Sciences, Karnataka, for M. Pharm (Pharmaceutical Analysis) 1st semester.
*not all topics have been included in this collection of notes.
As per the syllabus prescribed by Rajiv Gandhi University of Health Sciences, Karnataka, for M. Pharm (Pharmaceutical Analysis), 1st semester.
*not all topics have been covered in this file.
Ozempic: Preoperative Management of Patients on GLP-1 Receptor Agonists Saeid Safari
Preoperative Management of Patients on GLP-1 Receptor Agonists like Ozempic and Semiglutide
ASA GUIDELINE
NYSORA Guideline
2 Case Reports of Gastric Ultrasound
ARTIFICIAL INTELLIGENCE IN HEALTHCARE.pdfAnujkumaranit
Artificial intelligence (AI) refers to the simulation of human intelligence processes by machines, especially computer systems. It encompasses tasks such as learning, reasoning, problem-solving, perception, and language understanding. AI technologies are revolutionizing various fields, from healthcare to finance, by enabling machines to perform tasks that typically require human intelligence.
Title: Sense of Taste
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the structure and function of taste buds.
Describe the relationship between the taste threshold and taste index of common substances.
Explain the chemical basis and signal transduction of taste perception for each type of primary taste sensation.
Recognize different abnormalities of taste perception and their causes.
Key Topics:
Significance of Taste Sensation:
Differentiation between pleasant and harmful food
Influence on behavior
Selection of food based on metabolic needs
Receptors of Taste:
Taste buds on the tongue
Influence of sense of smell, texture of food, and pain stimulation (e.g., by pepper)
Primary and Secondary Taste Sensations:
Primary taste sensations: Sweet, Sour, Salty, Bitter, Umami
Chemical basis and signal transduction mechanisms for each taste
Taste Threshold and Index:
Taste threshold values for Sweet (sucrose), Salty (NaCl), Sour (HCl), and Bitter (Quinine)
Taste index relationship: Inversely proportional to taste threshold
Taste Blindness:
Inability to taste certain substances, particularly thiourea compounds
Example: Phenylthiocarbamide
Structure and Function of Taste Buds:
Composition: Epithelial cells, Sustentacular/Supporting cells, Taste cells, Basal cells
Features: Taste pores, Taste hairs/microvilli, and Taste nerve fibers
Location of Taste Buds:
Found in papillae of the tongue (Fungiform, Circumvallate, Foliate)
Also present on the palate, tonsillar pillars, epiglottis, and proximal esophagus
Mechanism of Taste Stimulation:
Interaction of taste substances with receptors on microvilli
Signal transduction pathways for Umami, Sweet, Bitter, Sour, and Salty tastes
Taste Sensitivity and Adaptation:
Decrease in sensitivity with age
Rapid adaptation of taste sensation
Role of Saliva in Taste:
Dissolution of tastants to reach receptors
Washing away the stimulus
Taste Preferences and Aversions:
Mechanisms behind taste preference and aversion
Influence of receptors and neural pathways
Impact of Sensory Nerve Damage:
Degeneration of taste buds if the sensory nerve fiber is cut
Abnormalities of Taste Detection:
Conditions: Ageusia, Hypogeusia, Dysgeusia (parageusia)
Causes: Nerve damage, neurological disorders, infections, poor oral hygiene, adverse drug effects, deficiencies, aging, tobacco use, altered neurotransmitter levels
Neurotransmitters and Taste Threshold:
Effects of serotonin (5-HT) and norepinephrine (NE) on taste sensitivity
Supertasters:
25% of the population with heightened sensitivity to taste, especially bitterness
Increased number of fungiform papillae
Prix Galien International 2024 Forum ProgramLevi Shapiro
June 20, 2024, Prix Galien International and Jerusalem Ethics Forum in ROME. Detailed agenda including panels:
- ADVANCES IN CARDIOLOGY: A NEW PARADIGM IS COMING
- WOMEN’S HEALTH: FERTILITY PRESERVATION
- WHAT’S NEW IN THE TREATMENT OF INFECTIOUS,
ONCOLOGICAL AND INFLAMMATORY SKIN DISEASES?
- ARTIFICIAL INTELLIGENCE AND ETHICS
- GENE THERAPY
- BEYOND BORDERS: GLOBAL INITIATIVES FOR DEMOCRATIZING LIFE SCIENCE TECHNOLOGIES AND PROMOTING ACCESS TO HEALTHCARE
- ETHICAL CHALLENGES IN LIFE SCIENCES
- Prix Galien International Awards Ceremony
Tom Selleck Health: A Comprehensive Look at the Iconic Actor’s Wellness Journeygreendigital
Tom Selleck, an enduring figure in Hollywood. has captivated audiences for decades with his rugged charm, iconic moustache. and memorable roles in television and film. From his breakout role as Thomas Magnum in Magnum P.I. to his current portrayal of Frank Reagan in Blue Bloods. Selleck's career has spanned over 50 years. But beyond his professional achievements. fans have often been curious about Tom Selleck Health. especially as he has aged in the public eye.
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Introduction
Many have been interested in Tom Selleck health. not only because of his enduring presence on screen but also because of the challenges. and lifestyle choices he has faced and made over the years. This article delves into the various aspects of Tom Selleck health. exploring his fitness regimen, diet, mental health. and the challenges he has encountered as he ages. We'll look at how he maintains his well-being. the health issues he has faced, and his approach to ageing .
Early Life and Career
Childhood and Athletic Beginnings
Tom Selleck was born on January 29, 1945, in Detroit, Michigan, and grew up in Sherman Oaks, California. From an early age, he was involved in sports, particularly basketball. which played a significant role in his physical development. His athletic pursuits continued into college. where he attended the University of Southern California (USC) on a basketball scholarship. This early involvement in sports laid a strong foundation for his physical health and disciplined lifestyle.
Transition to Acting
Selleck's transition from an athlete to an actor came with its physical demands. His first significant role in "Magnum P.I." required him to perform various stunts and maintain a fit appearance. This role, which he played from 1980 to 1988. necessitated a rigorous fitness routine to meet the show's demands. setting the stage for his long-term commitment to health and wellness.
Fitness Regimen
Workout Routine
Tom Selleck health and fitness regimen has evolved. adapting to his changing roles and age. During his "Magnum, P.I." days. Selleck's workouts were intense and focused on building and maintaining muscle mass. His routine included weightlifting, cardiovascular exercises. and specific training for the stunts he performed on the show.
Selleck adjusted his fitness routine as he aged to suit his body's needs. Today, his workouts focus on maintaining flexibility, strength, and cardiovascular health. He incorporates low-impact exercises such as swimming, walking, and light weightlifting. This balanced approach helps him stay fit without putting undue strain on his joints and muscles.
Importance of Flexibility and Mobility
In recent years, Selleck has emphasized the importance of flexibility and mobility in his fitness regimen. Understanding the natural decline in muscle mass and joint flexibility with age. he includes stretching and yoga in his routine. These practices help prevent injuries, improve posture, and maintain mobilit
Ethanol (CH3CH2OH), or beverage alcohol, is a two-carbon alcohol
that is rapidly distributed in the body and brain. Ethanol alters many
neurochemical systems and has rewarding and addictive properties. It
is the oldest recreational drug and likely contributes to more morbidity,
mortality, and public health costs than all illicit drugs combined. The
5th edition of the Diagnostic and Statistical Manual of Mental Disorders
(DSM-5) integrates alcohol abuse and alcohol dependence into a single
disorder called alcohol use disorder (AUD), with mild, moderate,
and severe subclassifications (American Psychiatric Association, 2013).
In the DSM-5, all types of substance abuse and dependence have been
combined into a single substance use disorder (SUD) on a continuum
from mild to severe. A diagnosis of AUD requires that at least two of
the 11 DSM-5 behaviors be present within a 12-month period (mild
AUD: 2–3 criteria; moderate AUD: 4–5 criteria; severe AUD: 6–11 criteria).
The four main behavioral effects of AUD are impaired control over
drinking, negative social consequences, risky use, and altered physiological
effects (tolerance, withdrawal). This chapter presents an overview
of the prevalence and harmful consequences of AUD in the U.S.,
the systemic nature of the disease, neurocircuitry and stages of AUD,
comorbidities, fetal alcohol spectrum disorders, genetic risk factors, and
pharmacotherapies for AUD.
- Video recording of this lecture in English language: https://youtu.be/lK81BzxMqdo
- Video recording of this lecture in Arabic language: https://youtu.be/Ve4P0COk9OI
- 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
Pulmonary Thromboembolism - etilogy, types, medical- Surgical and nursing man...VarunMahajani
Disruption of blood supply to lung alveoli due to blockage of one or more pulmonary blood vessels is called as Pulmonary thromboembolism. In this presentation we will discuss its causes, types and its management in depth.
Title: Sense of Smell
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the primary categories of smells and the concept of odor blindness.
Explain the structure and location of the olfactory membrane and mucosa, including the types and roles of cells involved in olfaction.
Describe the pathway and mechanisms of olfactory signal transmission from the olfactory receptors to the brain.
Illustrate the biochemical cascade triggered by odorant binding to olfactory receptors, including the role of G-proteins and second messengers in generating an action potential.
Identify different types of olfactory disorders such as anosmia, hyposmia, hyperosmia, and dysosmia, including their potential causes.
Key Topics:
Olfactory Genes:
3% of the human genome accounts for olfactory genes.
400 genes for odorant receptors.
Olfactory Membrane:
Located in the superior part of the nasal cavity.
Medially: Folds downward along the superior septum.
Laterally: Folds over the superior turbinate and upper surface of the middle turbinate.
Total surface area: 5-10 square centimeters.
Olfactory Mucosa:
Olfactory Cells: Bipolar nerve cells derived from the CNS (100 million), with 4-25 olfactory cilia per cell.
Sustentacular Cells: Produce mucus and maintain ionic and molecular environment.
Basal Cells: Replace worn-out olfactory cells with an average lifespan of 1-2 months.
Bowman’s Gland: Secretes mucus.
Stimulation of Olfactory Cells:
Odorant dissolves in mucus and attaches to receptors on olfactory cilia.
Involves a cascade effect through G-proteins and second messengers, leading to depolarization and action potential generation in the olfactory nerve.
Quality of a Good Odorant:
Small (3-20 Carbon atoms), volatile, water-soluble, and lipid-soluble.
Facilitated by odorant-binding proteins in mucus.
Membrane Potential and Action Potential:
Resting membrane potential: -55mV.
Action potential frequency in the olfactory nerve increases with odorant strength.
Adaptation Towards the Sense of Smell:
Rapid adaptation within the first second, with further slow adaptation.
Psychological adaptation greater than receptor adaptation, involving feedback inhibition from the central nervous system.
Primary Sensations of Smell:
Camphoraceous, Musky, Floral, Pepperminty, Ethereal, Pungent, Putrid.
Odor Detection Threshold:
Examples: Hydrogen sulfide (0.0005 ppm), Methyl-mercaptan (0.002 ppm).
Some toxic substances are odorless at lethal concentrations.
Characteristics of Smell:
Odor blindness for single substances due to lack of appropriate receptor protein.
Behavioral and emotional influences of smell.
Transmission of Olfactory Signals:
From olfactory cells to glomeruli in the olfactory bulb, involving lateral inhibition.
Primitive, less old, and new olfactory systems with different path
Surat @ℂall @Girls ꧁❤8527049040❤꧂@ℂall @Girls Service Vip Top Model Safe
Pesticide analysis
1. Presented by: Facilitated to:
Mr. L. Sanathoiba Singha
M. Pharm 1st Semester
Department of Pharmaceutical Analysis.
Mrs. Akkamma H. Godihal
Assistant Professor
Department of Pharmaceutical Analysis.
A presentation on
Karnataka College of Pharmacy
Bengaluru-64, Karnataka.
1
6. 11/2/2018 6
USE OF PESTICIDE IN AGRICULTURE
• In China as early as 3000 BC a mixture of lime, wood ash and chalk was used as insecticide for crops.
7. 11/2/2018 7
• Leonardo da Vinci noted that harmful insects can be destroyed with arsenic.
8. 11/2/2018 8
• In England, as early as the beginning of 19th century, lime-sulfur solution was applied to fruit trees to protect
them against powdery mildew.
9. 11/2/2018 9
It was only in the 20th century that organic chemistry started interacting with agriculture.
It was in the 1930s that the first modern pesticides like DDT (Dichlorodiphenyltrichloroethane), BHC (Benzene
hexachloride), organophosphates, etc were introduced.
12. 11/2/2018 12
• Pesticide use has increased 50-fold since 1950 and around 2.5 million tons of industrial pesticides per year
are used nowadays.
Figure 1. World market of pesticides since 1990. Values are expressed in millions of
U.S. dollars. (From European Crop Protection Association (ECPA) Review 2005–2006,
http:==www.ecpa.be.)
14. 11/2/2018 14
• Pesticides may ultimately affect non-target organisms such as humans, bees, wildlife, etc.
15. ORGANOPHOSPHORUS PESTICIDE ANALYSIS
INTRODUCTION:
P
O
R 1 O O R 3
O R 2
• Esters of phosphoric acid.
• Acts on acetylcholinesterase enzyme.
• Research on organophosphorus compounds is marked by
the works of Lassigne (1820); investigated the interaction
of alcohol and phosphoric acid.
• Lange and Krueger (1932) were the first to report the
strong bioactivity of organophosphorus compounds.
• Kept as secret during World War II for possible use in
chemical warfare.
1511/2/2018
16. 16
• Used as:
Insecticides e.g. fenitrothion and chlorpyrifos Herbicides e.g. glyphosate and glufosinate
11/2/2018
18. 18
MULTI RESIDUE METHOD FOR DETERMINATION OF ORGANOPHOSPHORUS PESTICIDES
Apparatus
A.
i. A gas chromatograph equipped with flame photometric detector operated in phosphorus mode (FPD-P), 526 mm
filter.
ii. Operating conditions:
Injector temperature 220°C
Baseline noise should be < 2%
iii. Columns :
SPB-5 (Supelco, Bellefonte, PA) or any equivalent 30m x 0.53mm
N2 carrier gas
11/2/2018
19. 19
B. Chromatographic cleanup columns:
Ready to use Extrelut-3, needle is fixed at column end as flow regulator.
Glass column 30cm x 20 mm with glass septum (Carbon-celite cleanup).
C. Chopper grinder.
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20. 20
D. High speed blender.
E. Rotary vacuum evaporator.
11/2/2018
21. 21
Reagents
i. Reference standard solutions: prepared using heptane or n-hexane (benzene is added if solubilization is
difficult)
ii. Solvents: Acetone, acetonitrile, benzene, dichloromethane, methanol, n-hexane (All HPLC grade).
iii. Silanized glass wool.
iv. Celite 545.
v. Active carbon.
vi. Sodium Chloride.
vii. Cotton wool washed with acetone and n-hexane.
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22. 22
Pesticide standard solutions:
i. Stock solutions of 1mg/ml using ethyl acetate.
ii. Working solution of 0.5μg/ml.
Extraction:
Foods are divided into three main groups according to moisture and fat content-
i. Group I (Vegetables and fruits):
50g of chopped sample is added into high speed blender jar.
100ml of acetone is added.
Blended for 2 mins at high speed.
Filtered with Buchner funnel.
Washed with 50ml acetone.
Extract brought to 150-200ml volume with acetone : water
(2:1).
ii. Group II (Milk):
100ml milk is taken in a separatory funnel.
150ml acetone is added.
Extracted first with 100ml methylene chloride.
Then again with 50ml of same.
Extract is dried over anhydrous sodium sulfate at 50-60°C,
under reduced pressure.
11/2/2018
23. 23
iii. Group III (Grains):
50gm chopped sample into high speed blender jar.
50 ml distilled water added.
Filtered with Buchner funnel.
Washed with 50ml acetone.
Extract brought to 150-200ml volume with acetone : water
(2:1).
Partition
• For all groups half the volume of food extract equivalent to 25g of sample is placed in a separatory
funnel.
• 100ml of dichloromethane, 100ml of acetone and 10g of sodium chloride is added.
• Shaken vigorously till most sodium chloride is dissolved.
• Layers are allowed to separate.
• Aqueous layer is transferred to a second separatory funnel.
• Organic layer is dried through sodium sulfate.
• 200ml of dichloromethane is added to the second separatory funnel.
• The organic layer is dried.
• All organic layers are collected and concentrated just to dryness in rotary vacuum evaporator.
11/2/2018
24. 24
Chromatographic column clean up
i. Group I and II
Glass column is filled with 2g celite.
4g of carbon celite (1:4) is added.
Topped with glass wool plug.
Column is washed with 20ml benzene.
Sample is transferred quantitatively with small portions of benzene.
Pesticide is eluted with 60ml of acetonitrile-benzene (1:1).
Concentrated just to dryness in rotary vacuum evaporator.
Suitable amount of benzene is added and analyzed by GC.
ii. Group II
Sample is transferred quantitatively to disposable Extrelut-3 with 3ml of n-hexane.
Solution is allowed to drain into filling material.
Waited for 10mins to obtained even distribution.
Eluted three times with 5ml acetonitrile-n-hexane (1:1).
Concentrated just to dryness in rotary vacuum evaporator.
Suitable amount of benzene is added and analyzed by GC.
11/2/2018
25. 25
Determination
Residues are quantified by height or area measurement from solution of known concentration of authentic
compounds.
Compounds Column
SPB-5 SP2250-SP2401
Acephate 0.26 0.97
Chlorpyriphos 1.18 0.82
Ethion 1.73 1.09
Monocrotophos 0.64 0.9
Paraoxon 1.06 1.08
Parathion 1.19 19
Pirimiphos-methyl 1.11 0.97
Table. GC retention times (min) for some organophosphorus insecticides relative to parathion-methyl.
11/2/2018
26. 26
Calculation
Residue level
mg
kg
=
h1 v1 V
h2 v2 m
𝑐
Where,
h1= peak height of the sample
h2= peak height of the standard
v1= μl of the standard injected
v2= μl of the extract injected
V= final volume of the sample extract (ml)
m= mass in g of the sample
c= concentration in ppm of reference solution.
11/2/2018
27. 27
ORGANOCHLORINE PESTICIDE ANALYSIS
INTRODUCTION:
• Insecticides
• Characterized by three kinds of chemicals:
DDT (Dichlorodiphenyltrichloroethane) analogs
BHC (Benzene hexachloride) isomers.
Cyclodiene compounds.
• Have a broad spectrum of activity on different families of
insect pests of fruits, vegetables and cotton.
• Most have been banned due to their toxicity owing to its
insolubility in water and very low vapor pressure.
11/2/2018
28. 11/2/2018 28
MULTI RESIDUE METHOD FOR DETERMINATION OF ORGANOCHLORINE PESTICIDES IN
MILK, FISH AND EGGS
Apparatus
i. Refrigerated centrifuge; able to rotate at 3000rpm at
15°C.
ii. SPE (Solid phase extraction) automate
iii. Rotary vacuum evaporator.
iv. Gas chromatograph system with injection device
and electron capture detector.
29. 11/2/2018 29
v. Capillary column- nonpolar dimethyl polysiloxane, thickness 0.25μg, 50m x 0.32mm.
vi. Pre-column- 1.5m x 0.32mm.
vii. Volumetric pipettes.
30. 11/2/2018 30
Reagents
• Pesticide standard solution in hexane
• Acetone
• Diethyl ether Petroleum ether
• n-hexane
• Acetonitrile
• Methanol
• Methyl chloride
• Dodecane
• Sodium sulfate anhydrous
• Filter paper
• Nonpolar SPE cartridge
• Polar SPE cartridge
• Mobile phase- Helium 99.99% purity;
filtered for oxygen and water
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General fat extraction
i. For milk:
50ml milk + 5ml methanol + 0.5g sodium oxalate, in separating funnel and shaken.
20ml diethyl ether is added and shaken again.
Repeated with 25ml petroleum ether.
Centrifuged for 5 mins at 1500rpm for 5 mins.
Organic phase is transferred into another separating funnel.
Aqueous phase is extracted twice with 50ml portions of ether and petroleum ether (1:1).
Combined solvent extracts washed over sodium sulfate anhydrous layer.
Evaporated using rotary vacuum evaporator at 35°C.
ii. For fish:
50ml of n-hexane + 20g of sample.
Mixed and centrifuged for 5 mins at 1500rpm.
Upper phase is decanted.
Extraction is repeated with 50ml n-hexane.
The two extracts are kept together.
Solvent evaporated at 35°C to 1ml.
Evaporation is finished with a gentle stream of nitrogen.
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iii. For eggs:
A beaker is taken.
15g sand + 15g sodium sulfate anhydrous + 10g sample is taken in the beaker and mixed.
A glass column with cotton wool swab is taken.
Sodium sulfate anhydrous is poured till 2cm of the column.
The contents of the beaker are poured in.
Eluted with 170ml n-hexane and acetone (2:1).
Solvent evaporated at 35°C to 1ml.
Evaporation is finished with a gentle stream of nitrogen.
Pesticide extraction:
• For each product pesticides are extracted from fat by cryogenic extraction.
• 0.5g fat extract in centrifuge tube.
• 3ml of acetonitrile and methylene chloride (75:25) is added.
• Mixed vigorously.
• Centrifuged for 20 mins at 3000rpm and 15°C.
• Upper layer kept supernatant.
• Bottom slowly heated to melt fat.
• Extraction repeated with 3ml of same solvent mixture.
• Solvent evaporated at 35°C to 2ml.
• Evaporation is finished with a gentle stream of nitrogen. (Solution A)
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Clean up
i. C18 SPE:
Cartridge is processed twice with 5ml petroleum + 5ml acetone + 5ml methanol.
Eluted to meniscus.
Solution A is loaded into the cartridge.
Eluted to meniscus (kept for 3 mins in contact).
Container of Solution A is washed with 10ml acetonitrile and loaded into the cartridge and eluted.
Elutant is evaporated at about 35°C with dodecane.
Diluted in n-hexane. (Solution B)
ii. Florisil SPE:
Cartridge is processed with 10ml n-hexane and eluted to meniscus.
Solution B is loaded.
Eluted with 10ml petroleum ether-diethyl ether (98:2) and 12ml of petroleum ether-diethyl ether (85:15).
The two fractions are mixed together.
Evaporated together with 100μl dodecane.
Final extract dissolved in appropriate volume of n-hexane for GC analysis. (Solution C)
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Gas chromatographic determination
Operation conditions:
Helium as mobile phase at 23 psi.
Initial oven temperature at 100°C, holding time 2 min.
Initial injector temperature at 50°C.
Detector temperature at 320°C.
Injection volume 1μl.
Calculation
Residue level
mg
kg
=
h1 v1 V
h2 v2 m
𝑐
Where,
h1= peak height of the sample
h2= peak height of the standard
v1= μl of the standard injected
v2= μl of the extract injected
V= final volume of the sample extract (ml)
m= mass in g of the sample
c= concentration in ppm of reference solution.
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REFERENCES:
Tadeo, J. L. Analysis of Pesticides in Food and Environmental Samples. CRC Press, New York. 2008.
3:10:19:20.
Ministry of Health and Family Welfare, Government of India. fssai Manual of Methods of Analysis of Foods
Pesticide Residues. 2012, Lab manual 11. 70-77:116-120.
Matolcsy, G, Nadasy, M and Andriska, V. Pesticide Chemistry. Elsevier Science Publishing Co. Inc., New York.
1988 (32). 108:15-16.
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