Drying

Step 1: Understanding the need for a specific dryer.
Heat-sensitive materials require a drying process that minimizes exposure to high temperatures. Vacuum dryers are commonly used for this purpose because they operate under reduced pressure, lowering the boiling point of solvents and thus preventing thermal degradation.
Step 2: Analyzing the options.
(A) Tray dryer: While tray dryers are commonly used, they expose materials to higher temperatures, making them unsuitable for heat-sensitive materials.
(B) Vacuum dryer: Correct — Vacuum dryers reduce the temperature required for drying by creating a vacuum, making them ideal for heat-sensitive materials.
(C) Tunnel dryer: This dryer uses continuous flow of air and may not be appropriate for materials sensitive to heat.
(D) Drum dryer: Drum dryers involve direct heat transfer and are not ideal for heat-sensitive materials.
Step 3: Conclusion.
The correct answer is (B) Vacuum dryer as it is specifically designed for drying heat-sensitive materials.

Step 1: Understanding Avicel pH 102.
Avicel pH 102 is a microcrystalline cellulose (MCC) that is commonly used as a binder in tablet formulations. It is available in powder form, which is easy to handle and mix in formulations.
Step 2: Analyzing the options.
(1) Powder form: Correct — Avicel pH 102 is typically available as a fine powder.
(2) Granular form: Incorrect, it is not typically available in granular form.
(3) Semisolid form: Incorrect, Avicel pH 102 is not available in semisolid form.
(4) Liquid crystalline state: Incorrect, this is not a form of Avicel pH 102.
Step 3: Conclusion.
Avicel pH 102 is available in (1) Powder form.

Step 1: Understanding cryo-protectants.
Cryo-protectants are substances used to protect biological materials from damage during freezing. They help minimize protein denaturation and prevent ice crystal formation in biological samples.
Step 2: Analyzing the options.
(1) Tonicity modification: Incorrect, cryo-protectants do not primarily modify tonicity.
(2) pH adjustment: Incorrect, cryo-protectants are not typically used for pH adjustment.
(3) Viscosity contributor: Incorrect, this is not the primary function of cryo-protectants.
(4) Protein denaturation minimizing agents: Correct — Cryo-protectants are used to minimize protein denaturation during freezing and thawing.
Step 3: Conclusion.
The correct function of cryo-protectants is to act as (4) Protein denaturation minimizing agents.