BP 403 T. PHYSICAL PHARMACEUTICS-II (Theory)

About Course

Scope: The course deals with the various physica and physicochemical properties, and
principles involved in dosage forms/formulations. Theory and practical
components of the subject help the student to get a better insight into various
areas of formulation research and development, and stability studies of
pharmaceutical dosage forms.
Objectives: Upon the completion of the course student shall be able to
1. Understand various physicochemical properties of drug molecules in the
designing the dosage forms
2. Know the principles of chemical kinetics & to use them for stability testing nad
determination of expiry date of formulations
3. Demonstrate use of physicochemical properties in the formulation
development and evaluation of dosage forms

Course Content

UNIT I – Colloidal dispersions
Classification of dispersed systems & their general characteristics, size & shapes of colloidal particles, classification of colloids & comparative account of their general properties. Optical, kinetic & electrical properties. Effect of electrolytes, coacervation, peptization& protective action

UNIT-II Rheology
Newtonian systems, law of flow, kinematic viscosity, effect of temperature, non-Newtonian systems, pseudoplastic, dilatant, plastic, thixotropy, thixotropy in formulation, determination of viscosity, capillary, falling Sphere, rotational viscometers

Deformation of solids
Plastic and elastic deformation, Heckel equation, Stress, Strain, Elastic Modulus

UNIT III – Coarse dispersion
Suspension, interfacial properties of suspended particles, settling in suspensions, formulation of flocculated and deflocculated suspensions. Emulsions and theories of emulsification, microemulsion and multiple emulsions; Stability of emulsions, preservation of emulsions, rheological properties of emulsions and emulsion formulation by HLB method.

UNIT IV – Micromeretics
Particle size and distribution, mean particle size, number and weight distribution, particle number, methods for determining particle size by different methods, counting and separation method, particle shape, specific surface, methods for determining surface area, permeability, adsorption, derived properties of powders, porosity, packing arrangement, densities, bulkiness & flow properties

UNIT-V Drug stability
Reaction kinetics: zero, pseudo-zero, first & second order, units of basic rate constants, determination of reaction order. Physical and chemical factors influencing the chemical degradation of pharmaceutical product: temperature, solvent, ionic strength, dielectric constant, specific & general acid base catalysis, Simple numerical problems. Stabilization of medicinal agents against common reactions like hydrolysis & oxidation. Accelerated stability testing in expiration dating of pharmaceutical dosage forms. Photolytic degradation and its prevention

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