Pharmaceutical Materials and Properties

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Questions and Answers

What is the purpose of the screen in the base of the mill casing?

To retain material in the mill until sufficient size reduction (correct)

To separate different sizes of material

To grind the material further

To increase the speed of the mill

What happens to the material in the mill until a certain point?

It is discarded

It is immediately discharged

It is retained until a sufficient degree of size reduction (correct)

It is only partially ground

What is a characteristic of the screen in the mill?

It is adjustable

It is removable

It is self-classifying (correct)

It is manual

What is the outcome of the material being retained in the mill?

It undergoes a sufficient degree of size reduction (A) Signup and view all the answers

What is the function of the screen in relation to the material?

To retain the material until a sufficient degree of size reduction (B) Signup and view all the answers

What can heat affect?

Thermolabile materials (B) Signup and view all the answers

What can affect the size of a product?

Heat (A) Signup and view all the answers

What is the effect of heat on thermolabile materials?

Destruction (C) Signup and view all the answers

What is a characteristic of thermolabile materials?

They are sensitive to heat (B) Signup and view all the answers

What type of materials are affected by heat?

Thermolabile materials (D) Signup and view all the answers

What type of pharmaceutical materials have high toughness?

Fibrous drugs (B) Signup and view all the answers

What is a characteristic of fibrous pharmaceutical materials?

High toughness (C) Signup and view all the answers

Which of the following pharmaceutical materials are NOT characterized by high toughness?

Liquid drugs (B) Signup and view all the answers

What is a common property of pharmaceutical materials that are fibrous in nature?

High toughness (D) Signup and view all the answers

Which of the following is a characteristic of many pharmaceutical materials?

High toughness (B) Signup and view all the answers

What is the result of excessive feed?

Cushioning effect (C) Signup and view all the answers

What is the opposite of a cushioning effect?

Size reduction (A) Signup and view all the answers

What occurs when feed is excessive?

Cushioning effect (B) Signup and view all the answers

What is the term for too much feed?

Excessive feed (B) Signup and view all the answers

At what point does maximum size reduction occur?

When feed is sufficient (A) Signup and view all the answers

What type of materials are typically processed using coarse degree of size reduction?

Tough fibrous materials (B) Signup and view all the answers

What is the purpose of coarse degree of size reduction for tough fibrous materials?

To facilitate extraction (A) Signup and view all the answers

Which of the following examples is NOT a type of material that requires coarse degree of size reduction?

Spinach (C) Signup and view all the answers

What is the significance of coarse degree of size reduction in the processing of tough fibrous materials?

It is necessary prior to extraction (B) Signup and view all the answers

What is the characteristic of materials that require coarse degree of size reduction?

They are tough and fibrous (C) Signup and view all the answers

Study Notes

Milling in Pharmaceutical Materials

Fibrous drugs, such as roots, peels, and wood, exhibit high toughness.
A screen in the mill casing acts as a self-classifying mechanism, retaining material until a sufficient degree of size reduction is achieved.
Coarse size reduction is suitable for tough fibrous materials, such as liquorice and rhubarb, prior to extraction.

Factors Affecting Milling

Heat can affect thermolabile materials during the milling process.
The size of the product can be controlled, with maximum size reduction occurring under optimal conditions.

Milling Limitations

Excessive feed can produce a cushioning effect, limiting the milling process.

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Description

This quiz covers the properties of pharmaceutical materials, including their toughness and structure, particularly in fibrous drugs.