Pharmaceutics in Pharmacy : Practice MCQ Questions & Answers with Explanations

Soft gelatin capsules are a popular dosage form used to encapsulate various pharmaceutical and nutraceutical products. The capsules are made from a gelatin base that can be made elastic or plastic-like by adding certain excipients. Sorbitol is a polyol (sugar alcohol) that is commonly used as a plasticizer in the manufacturing of soft gelatin capsules. It helps to make the gelatin shell more flexible and elastic, improving its handling and durability. The addition of sorbitol helps in maintaining the integrity of the capsule, preventing it from becoming too brittle or too rigid, which can cause cracking or breaking.

**_ Povidone, also known as polyvinylpyrrolidone (PVP), is used as a binder in tablet formulations and as a solubilizing agent. It is not used as a plasticizer in the production of soft gelatin capsules. PEG is used as a plasticizer in various pharmaceutical formulations, but it is more commonly used in solid dosage forms and ointments rather than in soft gelatin capsules. It does not impart the same level of elasticity as sorbitol. HPMC is a cellulose derivative used as a film-former and thickening agent in pharmaceutical formulations. It is not typically used as a plasticizer for soft gelatin capsules but is more commonly used in controlled-release formulations and as a coating material. Among the given options, sorbitol is the correct plasticizer used to make the shells of soft gelatin capsules elastic or plastic-like. It ensures the capsules are flexible and durable, preventing issues such as cracking or breaking.

A disintegrator is a type of mill that is specifically designed for the purpose of powdering hard crude drugs. It operates by using mechanical impact to break down the materials into fine particles, making it suitable for tough and resilient substances. The disintegrator mill works by feeding the drug into a chamber where rotating hammers or blades repeatedly impact the material, causing it to break apart into smaller and smaller pieces until the desired fineness is achieved.

**_ The edge runner mill consists of a pair of heavy wheels that rotate around a central axis and crush the material underneath. It is primarily used for mixing and grinding pastes or semi-solids rather than for powdering hard crude drugs. A colloidal mill is used to reduce the particle size of a solid suspended in a liquid, creating a colloidal suspension. It is not suitable for dry materials or for powdering hard crude drugs. The fluid energy mill, also known as a jet mill, uses high-speed jets of compressed air or inert gas to impact particles and cause them to collide and break apart. While effective for fine powders, it is not typically used for hard crude drugs due to the need for precise control over particle size and energy input. Among the given options, the disintegrator is the most suitable mill for powdering hard crude drugs due to its mechanical impact mechanism, which efficiently breaks down tough materials into fine particles.

Transfusion bottles are typically made of either neutral glass or borosilicate glass due to their excellent chemical resistance and durability. Neutral glass is chemically stable and resistant to a wide range of substances, making it suitable for medical applications such as transfusion bottles. Borosilicate glass is known for its high thermal resistance and low coefficient of thermal expansion, which makes it ideal for use in environments where temperature changes are frequent. It also offers excellent chemical durability.

**_ While neutral glass is indeed used for transfusion bottles due to its chemical stability and resistance, it is not the only type of glass used. Therefore, considering only neutral glass is not completely accurate. Borosilicate glass is a preferred material for many medical applications due to its thermal resistance and durability. However, similar to neutral glass, it is not the sole material used for transfusion bottles. Soda glass, also known as soda-lime glass, is commonly used in the production of bottles and jars for food and beverages due to its lower cost. However, it is not suitable for medical applications like transfusion bottles because it lacks the chemical resistance and durability required. Transfusion bottles are made of both neutral glass and borosilicate glass due to their superior chemical resistance and durability, making them suitable for medical applications. Soda glass, on the other hand, does not meet the necessary standards for such use.

A dip tube in an aerosol container is a crucial component that extends from the valve down to the bottom of the can. It allows the liquid product to be drawn up and expelled when the valve is activated. Polyethylene Glycol (PEG) is a common material used for making dip tubes due to its flexibility, durability, and resistance to a wide range of chemicals. PEG ensures that the dip tube can withstand the pressure and chemical composition of the aerosol contents without degrading. The use of PEG in dip tubes helps in maintaining the integrity and functionality of the aerosol system, ensuring consistent delivery of the product until the container is empty.

**_ Sorbitol is a sugar alcohol commonly used as a sweetener and humectant in food and pharmaceutical products. It is not suitable for making dip tubes due to its lack of structural integrity and chemical resistance required for aerosol containers. Povidone, also known as polyvinylpyrrolidone (PVP), is used as a binder in pharmaceuticals, a stabilizer in cosmetics, and an adhesive in various applications. However, it does not possess the necessary mechanical properties to function as a dip tube in aerosol containers. Hydroxypropyl Methylcellulose (HPMC) is used as a thickening agent, emulsifier, and film former in various industries. While it has good film-forming properties, it is not suitable for use as a dip tube material due to its lack of flexibility and chemical resistance. Among the given options, PEG (Polyethylene Glycol) is the most appropriate material for making dip tubes in aerosol containers. Its chemical resistance, flexibility, and durability make it ideal for ensuring the efficient and consistent functioning of aerosol systems.