This document presents information on preformulation studies, which involve characterizing the physicochemical properties of new drug molecules. The objectives are to generate stability and bioavailability data for formulation development. Key studies discussed include analyzing bulk properties, solubility, partitioning, hygroscopicity, ionization, dissolution, stability, and compatibility. Analytical techniques like spectroscopy, microscopy, thermal analysis, and chromatography are used to investigate properties and purity. Thorough preformulation provides critical information for designing dosage forms that are stable, safe, and effective.
WHAT IS COMPRESSION ?
Compression means reduction of bulk volume of material as a result of the removal of gaseous phase (air) by applied pressure
WHAT IS CONSOLIDATION?
Consolidation is an increase in mechanical strength of material resulting from particle - particle interactions.
It includes Introductory part about what is Dissolution...then Mechanism of Dissolution is elaborated...Theories of Dissolution also given..It also includes Factors affecting Dissolution profile..Along with References given below for easily searching..
WHAT IS COMPRESSION ?
Compression means reduction of bulk volume of material as a result of the removal of gaseous phase (air) by applied pressure
WHAT IS CONSOLIDATION?
Consolidation is an increase in mechanical strength of material resulting from particle - particle interactions.
It includes Introductory part about what is Dissolution...then Mechanism of Dissolution is elaborated...Theories of Dissolution also given..It also includes Factors affecting Dissolution profile..Along with References given below for easily searching..
Dissolution, factors affecting drug dissolution, methods to evaluate dissolution, advantages and disadvantages, recent approaches--these are the topics covered in this presentation.
In this slide contains introduction, copmpression, consolidation, compaction, heckel plots and equation, interpretation and application.
Presented by: NARAYAN SINGH UDIT (Department of pharmaceutics).
RIPER, anantapur
What is dissolution? Dissolution is a process in which a solid substance get solubilizes in a particular solvent to yield a solution i.e. mass transfer from the solid surface to the liquid phase.
SOLID DISPERSION
Definition: The technology is the science of dispersing one or more active ingredients in an inert matrix in the solid stage.
Need of solid dispersion:
Increases Oral bioavailability of a drug
Increased dissolution rate.
Enhanced release of drugs from ointment.
Improved the solubility & stability.
The concept of solid dispersion was originally proposed by Sekiguchi & obi.
Increasing the dissolution, absorption & therapeutic efficacy of drugs in dosage forms.
Increasing solubility in water.
Improving the oral absorption and bioavailability of BCS Class II drugs.
The Metformin HCL Gastroretentive Floating Sustained released Tablet is formulated by the Wet Granulation technique. This Tablet is containing both Effervescent as well as Non Effervescent system. The HPMC K 100 Swellable polymer is responsible for the Floating. (Non Effervescent system) and The Sodium Bicarbonate is responsible for
the effervescent system. A combination of HPMC K 100 and Xanthum Gum shows better sustained release activity. The Prepared Gastroretentive Floating Sustained released Tablet is Evaluated In terms of bulk density, tapped density, angle of repose, Carr’s Index and, weight variation test, friability test and in vitro study, Total Floating Time. The result associated in Optimized batch is good to Satisfactory and having a good free flowing property. The weight variation and friability these values are within the pharmacopeia limit. The in vitro Dissolution studies shows Maximum percentage of release of drug (99.25) with in end of 8 Hours.
Physics of Tablet compression is very useful during study of the tablet. It contains the mechanism of tablet compression. It also contains the process of tablet compression.
drug execipent compatibilty studies is of prime importance for the better formulation of the new drug and also for reducing cost by verfication of the data at the earlier atage.
this presentation will give the brief explanation of the goal, importance, dteps involve to studi the drug execient compatibility studies with different examples suitable accordiingly.
Dissolution, factors affecting drug dissolution, methods to evaluate dissolution, advantages and disadvantages, recent approaches--these are the topics covered in this presentation.
In this slide contains introduction, copmpression, consolidation, compaction, heckel plots and equation, interpretation and application.
Presented by: NARAYAN SINGH UDIT (Department of pharmaceutics).
RIPER, anantapur
What is dissolution? Dissolution is a process in which a solid substance get solubilizes in a particular solvent to yield a solution i.e. mass transfer from the solid surface to the liquid phase.
SOLID DISPERSION
Definition: The technology is the science of dispersing one or more active ingredients in an inert matrix in the solid stage.
Need of solid dispersion:
Increases Oral bioavailability of a drug
Increased dissolution rate.
Enhanced release of drugs from ointment.
Improved the solubility & stability.
The concept of solid dispersion was originally proposed by Sekiguchi & obi.
Increasing the dissolution, absorption & therapeutic efficacy of drugs in dosage forms.
Increasing solubility in water.
Improving the oral absorption and bioavailability of BCS Class II drugs.
The Metformin HCL Gastroretentive Floating Sustained released Tablet is formulated by the Wet Granulation technique. This Tablet is containing both Effervescent as well as Non Effervescent system. The HPMC K 100 Swellable polymer is responsible for the Floating. (Non Effervescent system) and The Sodium Bicarbonate is responsible for
the effervescent system. A combination of HPMC K 100 and Xanthum Gum shows better sustained release activity. The Prepared Gastroretentive Floating Sustained released Tablet is Evaluated In terms of bulk density, tapped density, angle of repose, Carr’s Index and, weight variation test, friability test and in vitro study, Total Floating Time. The result associated in Optimized batch is good to Satisfactory and having a good free flowing property. The weight variation and friability these values are within the pharmacopeia limit. The in vitro Dissolution studies shows Maximum percentage of release of drug (99.25) with in end of 8 Hours.
Physics of Tablet compression is very useful during study of the tablet. It contains the mechanism of tablet compression. It also contains the process of tablet compression.
drug execipent compatibilty studies is of prime importance for the better formulation of the new drug and also for reducing cost by verfication of the data at the earlier atage.
this presentation will give the brief explanation of the goal, importance, dteps involve to studi the drug execient compatibility studies with different examples suitable accordiingly.
Preformulation and physicochemical property of the drugSHIVANEE VYAS
“It is the study of the physical and chemical properties of the
drug prior to compounding process”.
Preformulation commences when a newly synthesized drug shows sufficient pharmacologic promise in animal models towarrant evaluation in man.
These studies should focus on physicochemical properties of new compound that affect drug performance & development of efficaciouss dosage form.
This properties may provide;
A rationale for formulation design
Support the need for molecular modification.
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
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The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
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http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
How to Create Map Views in the Odoo 17 ERPCeline George
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1. A SEMINAR ON
PREFORMULATION STUDIES:
PHYSICOCHEMICAL
CHARACTERIZATION
OF NEW DRUG MOLECULES
Presented By:-
BHATT BHAVIK R.
1st M- Pharm.
Department of Pharmaceutics.
NGSM IPS, Mangalore
1
3. INTRODUCTION
Preformulation testing is the first step in the rational
development of dosage forms.
It can be defined as an investigation of physical and chemical
property of a drug substance alone and when combined with
excipients.
Physiochemical properties are those that can be determined
from in vitro experiments.
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4. OBJECTIVES
• The main objective is to generate information
useful to the formulation in developing most
stable and bioavailable dosage form that mass
can be produced.
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5. Why is Preformulation Important ?
It describes the process of optimizing the delivery
of drug thorough determination of physical, chemical
properties of new drug molecule that affect drug
performance and development of an efficacious stable
and safe dosage form.
Preformulation studies on a new drug molecule
provide useful information for subsequent formulation
of a physicochemically stable and biopharmaceutically
suitable dosage form.
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6. 1. BULK PROPERTIES
Bulk properties of the solid form such as crystallinity,
polymorphism, particle size, powder flow property, and surface
characteristics are likely to change during process development.
Crystallinity
The crystal habit describes the outer appearance of crystals
( platy, equant, needle, bladed, etc.) and internal structure
arrangement.
Compounds have several different habits, depending on the
environment for growing crystals.
PHYSICOCHEMICAL PROPERTIES
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7. Polymorphism
polymorphism is the ability of the compound to crystallize as
more than one distinct crystalline species with different internal
structure.
Formation of different polymorphs depends on solvents,
temperature, pressure, rate of cooling, etc.
Polymorphic transitions can also occur during milling, granulating,
drying and compressing operations
Different polymorphs vary in physical properties such as
dissolution, solid-state stability, compatibility, etc
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8. Particle size
Study of particle size give an information about solubility,
dissolution rate, absorption, etc.
particle size and surface area of a solid drug are inversely
related to each other.
eg: Griseofulvin
Powder flow property
The flow properties of a powder will determine the nature and
quantity of excipients needed to prepare a compressed or a powder
dosage form.
This refers mainly to factors such as the ability to process the
powder through machines.
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9. HYGROSCOCITY
The tendency of a solid to take up water from the
atmosphere, as it is subjected to a controlled RH program
under isothermal condition i.e. hygroscopicity.
Classified based on the amount of rate of water uptake when
a solid is exposed to controlled RH value at a specified
temperature.
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10. 1. AQUEOUS SOLUBILITY
Important goal of the preformulation effort is to devise a
method for making solutions of the drug
Orally administered drug must dissolve in the aqueous fluid of
the GIT prior to absorption.
Solubility can be improved by addition of cosolvents.
Solubilities cannot be determined by precipitative methods.
SOLUBILITY ANALYSIS
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11. 2. Drug pKa / Ionization at physiological pH
pKa is the dissociation constant of a drug.
The nonionized substances is lipid soluble thus
dissolve in lipid material of the membrane and transported
by passive diffusion.
Where as, the ionized substances is a lipid insoluble
therefore permeation is slow.
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12. The percentage of ionization can be calculated as …
For Acidic compounds:
For Basic compounds:
Degree of ionization depends up on the pH.
for acidic drugs pKa ranges from 3-7.5.
for basic drugs pKa ranges from 7-11.
% ionized = 100/ 1+ antilog (pH – pKa)
% ionized = 100/ 1+ antilog (pKa – pH)
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13. 3. PARTITION COEFFICIENT
Partition coefficient influence permeation of a drug
across biological membrane.
Partition coefficient is a ratio of equilibrium
concentration of drug in oil phase to equilibrium
concentration of drug in aqueous phase .
where, Co-organic phase concentration
Cw-aqueous phase concentration
K=Co/Cw
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14. Following administration, the drug must travel
through a variety of membranes to gain access to the
target area.
Drug with extremely high partition co-efficient
(i.e. very oil-soluble ) readily penetrate the
membranes.
While drugs with excessive aqueous solubility i.e.
low oil/water partition co-efficient cannot penetrate
the membrane.
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15. DISSOLUTION
To know the gastrointestinal absorption & other
physicochemical properties.
The intrinsic dissolution rate is determined by the rotating
disc method.
The dissolution rate is described by Noyes-Whiteny equation.
Intrinsic dissolution
Paricular dissolution
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16. DRUG STABILITY
In this study includes both solutions and solid-state
experiments under various conditions for handling, formulation,
storage, and in vivo administration.
solution phase stability: The effect of pH on stability is
important in the development of both oral and Parenteral dosage
forms
Acid sensitive drugs protected from highly acidic
environment of the stomach by coating it with
suitable polymers.
Solid phase stability depends on several factors like
temperature, pH, humidity, hydrolysis, oxidation, etc…
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17. COMPATIBILITY
Compatibility test play a very important role in the
preformulation studies of oral dosage forms.
Problems arise because of the interaction with other
drug substances and with preservatives, stabilizers, dyes,
and flavors.
It is important for the formulator of a new drug
substance to know with which excipients he can work and
which he cannot.
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18. ANALYTICAL MEASURES
Various analytical techniques are available for the
investigation of the physicochemical properties and
determination of impurity of new drug molecules.
These includes:
1. Microscopy
2. Spectroscopy
3. Chromatography
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19. A. MICROSCOPY:
In this technique substances are examined under the
microscope.
It gives information about shape, thickness, particle
size, etc. of drug molecules.
By this method we can study crystal morphology,
difference between polymorphic character of molecule.
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20. B. SPECTROSCOPY
UV and Visible Spectrophotometry
When organic molecules in solution, or as liquid, are
exposed to light in the visible and ultraviolet light regions of
spectrum, they absorb light of particular wavelengths depending
on the type of electronic transition that is associated with the
absorption.
The electronic transitions depends on the electron
bonding with in the molecule.
Spectrophotometry can be used to study to enzyme reaction
and to evalute the effect of drug on enzyme.
UV study of compounds gives information regarding
unsaturation of compounds.
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21. IR Spectroscopy
The study of the interaction of electromagnetic radiation with
vibrational and rotational resonances within a molecular structure
is termed as IR Spectroscopy.
IR has the ability to differentiate isomers groups such as Cis-
trans double bond compound.
Gives an information regarding functional group present in
new drug molecule.
FT-IR use for both qualitative and quqntitative analysis of
sample.
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22. X-RAY DIFFRACTION
When a beam of non homogenous x-rays is allowed to pass through
a sample the x-ray beam is diffracted & it is recorded by means of
photographic plates .
Single Crystal X-ray provides the most complete information about the
solid state.
It is used to differentiate the amophous and crystalline forms.
This method is tedious, time consuming & hence unsuitable for routine
use.
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23. Thermal Analysis
Differential scanning calorimetry (DSC) and differential
thermal analysis(DTA) are particularly useful in
preformulation studies including purity, polymorphism,
solvation, degradation, and excipient compatibility.
It measures physical or chemical changes of drug
molecules.
Thermigravimetric analysis
Used to detect the existange and stability of solvated
drug molecule.
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24. C. CHROMATOGRAPHY
In the preformulation studies, chromatographic
techniques such as TLC, HPLC,GC carrying a major role.
The major advantages are direct analysis of aqueous
samples, high sensitivity, and specific determination of
drug concentration, separation of drug from impurities
or degradation products.
Analytical data from TLC may be required to precisely
determine the kinetics of decomposition.
HPLC and GC are useful for solubility measurements.
1/31/2015
24
25. CONCLUSION
Preformulation studies on a new drug molecule
provide useful information for subsequent
formulation of a Physicochemically stable and
Biopharmaceutically suitable dosage form.
Thorough Preformulation work is the
foundation of developing efficacious and economical
formulations.
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26. REFERENCES
1) Banker GS, Rhodes CT., Modern pharmaceutics, 4th ed. New
York: Marcel Dekker; 2002. p.167-184
2) Alfred Martin., Physical pharmacy. 4th ed. New York:
Lippincott Williams & Wilkins; 2001. p. 77-100
3) Remington, The Science and Practice of Pharmacy, 20th
Edition, B.I Publication Pvt Ltd.p.940-42
4) Leon Lachman, Herbert AL, Joseph LK., The theory and
practice of industrial pharmacy, 3rd ed. Bombay: Varghese
publishing house; 1990. p. 171- 196
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