To understand the enduring value of Subrahmanyam's work, it helps to examine how the textbook handles the core mechanics of drug formulation. Micromeritics: The Science of Small Particles
Textbook of Physical Pharmaceutics by Dr. C.V.S. Subrahmanyam is a foundational resource in pharmaceutical material science, specifically designed to explain the physical and chemical principles governing drug materials and dosage form formulation .
Physical pharmaceutics bridges the gap between pure chemistry and clinical formulation. Dr. Subrahmanyam’s approach simplifies complex thermodynamic and physical principles, applying them directly to medicine manufacturing.
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Nernst’s partition coefficient, its limitations, and its application in predicting drug preservation and biological membrane permeability. 3. Surface and Interfacial Phenomena
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A desirable property where a gel becomes fluid when shaken, allowing easy pouring, and reverts to a gel on standing to keep particles suspended. 6. Micromeritics To understand the enduring value of Subrahmanyam's work,
The book systematically covers the essential pillars of physical pharmacy:
The book contains numerous figures and data tables to aid in understanding.
The flow properties of liquids and semi-solids, crucial for ointments and suspensions. Key Topics Covered Covers surface and interfacial tension
The property of certain gels or fluids that are thick or viscous under static conditions but flow when shaken or agitated. This ensures that a suspension pours easily after being shaken but stays uniform on the shelf. 5. Micromeritics
In solid dosage forms like tablets and capsules, particle size governs everything from content uniformity to dissolution rates. Subrahmanyam offers an in-depth breakdown of methods used to determine particle size, such as microscopy, sieving, and sedimentation. Understanding powder flowability and packaging properties is essential for industrial-scale manufacturing. Interfacial Phenomena and Stabilization
Micromeritics is the science and technology of small particles. Since most drugs are administered as solids (tablets and capsules), understanding particle characteristics is mandatory. Key concepts include: Methods for determining particle size and distribution. Particle shape, surface area, and pore volume.
Covers surface and interfacial tension, adsorption at liquid and solid interfaces, and HLB (Hydrophilic-Lipophilic Balance) values.