L2: Surfactants

Question 0

Are surfactants soluble, in what?

Answer 0

Organic solvent

Water

Question 1

What are surface active agents or surfactants

Answer 1

Molecules and ions that are ADSORBED at interfaces.

Question 2

Surfactants contain both hydrophobic and hydrophilic groups, t or f?

Answer 2

TRUEE.

Question 3

What could the hydrophilic regions of a surfactant be?

Answer 3

Anionic
Cationic
Zwitterionic
Non ionic

Question 4

What are the hydrophobic regions in a surfactant?

Answer 4

Saturated or unsaturated hydrocarbons chains.

Heterocyclic or aromatic rings.

Question 5

Why are anionic surfactants not suitable for oral dosage forms

Answer 5

Unpleasant taste, gut irritation.

Question 6

Name an example of a anionic surfactant

Answer 6

Sodium lauryl sulfate BP

Question 7

Pharmaceutical use of anionic surfactants

Answer 7

Preoperative skin cleaner, due to its bacteriostatic action against gram positive bacteria.

And medicated shampoos

Question 8

Pharmaceutical use of Cationic surfactants

Answer 8

Solutions used to clean wounds and skin,

Store sterilised surgical instruments

Question 9

Example of Cationic surfactant

Answer 9

Cetrimide

Domiphem bromide

Question 10

What is a zwitterionic surfactant.

Answer 10

Known as ‘internal salt’

Has an anion and cation in one molecule chemically joined together.

Question 11

Pharmaceutical use of zwitterionic surfactants

Answer 11

Fairly limited

In skin care products as mild detergents.