DISPERSE SYSTEMS

Question 1

Is a dispersion in which the dispersed phase is composed of small globules of a liquid distributed throughout a vehicle in which it is immiscible. They consist of globules that have diameters equal to or greater than those of the largest colloidal particles.

Answer 1

EMULSIONS

Question 2

In emulsion terminology, the dispersed phase is called?

Answer 2

INTERNAL PHASE

Question 3

In emulsion terminology, the dispersion medium is called?

Answer 3

EXTERNAL OR CONTINOUS PHASE

Question 4

Emulsions with an oleaginous internal phase and an aqueous external phase are ________ emulsions.

Answer 4

OIL-IN-WATER (O/W)

Question 5

Emulsions having an aqueous internal phase and an oleaginous external phase are termed as?

Answer 5

WATER-IN-OIL (W/O)

Question 6

What is the third phase or substance in an emulsion system?

Answer 6

EMULSIFYING AGENT

Question 7

It is necessary and is incorporated to prevent separation of the two phases?

Answer 7

EMULSIFYING AGENT

Question 8

4 Phases:

Answer 8

DISPERSED PHASE
DISPERSION MEDIUM
AQUEOUS PHASE
NON-AQUEOUS PHASE

Question 9

The purpose of the different phases:

Answer 9

INCREASE SOLUBILITY
INCREASE STABILITY
PROLONG DRUG ACTION
IMPROVE TASTE
IMPOROVE APPEARANCE

Question 10

Oil is dispersed as droplets in an aqueous phase or medium?

Answer 10

OIL-IN-WATER EMULSION (O/W)

Question 11

•Oral and external products
•Washable Products

Answer 11

OIL-IN-WATER EMULSION (O/W)

Question 12

Water is dispersed as droplets in an oleaginous medium.

Answer 12

WATER-IN-OIL EMULSION (W/O)

Question 13

It is used for external preparations when emollient, lubricating or protective properties are desired.

Answer 13

WATER-IN-OIL EMULSION (W/O)

Question 14

O/W or W/O

Answer 14

MULTIPLE EMULSIONS

Question 15

It is translucent or transparent

Answer 15

MACROEMULSIONS

Question 16

It is used to prevent the coalescence and maintain the integrity of the individual droplets of dispersed liquid.

Answer 16

EMULSIFYING AGENT

Question 17

Effectiveness depend on its:
•Chemical Structure
•Concentration
•Solubility
•pH
•Physical Properties
•Electrostatic Effect

Answer 17

EMULSIFYING AGENTS

Question 18

2 types of emulsifying agents:

Answer 18

TRUE EMULSIFYING AGENTS
STABILIZERS

Question 19

Are capable of forming and stabilizing emulsions by themselves?

Answer 19

TRUE EMULSIFYING AGENTS

Question 20

Examples of True emulsifying agents:

Answer 20

ACACIA
GUM ARABIC

Question 21

They do not form acceptable emulsions when used alone, but do not assist primary agents in stabilizing the product.

Answer 21

STABILIZERS

Question 22

5 examples of stabilizers:

Answer 22

AGAR
GULAMAN
CHONDRUS
DEXTRIN
MALT EXTRACT

Question 23

Natural emulsifying agents -ANIMAL SOURCE

Answer 23

CASEIN
CHOLESTEROL
EGGWOLK
GELATIN
WOOLFAT

Question 24

Natural emulsifying agents- VEGETABLE SOURCE

Answer 24

AGAR
ACACIA
PECTIN
CHONDRUS
TRAGACANTH

Question 25

Have high pH and therefore sensitive to the addition of acids and electrolytes.

Answer 25

ANIONIC SYNTHETIC AGENTS

Question 26

Ex. Sodium Lauryl Sulfate

Answer 26

SULFURIC ACID ESTER

Question 27

Ex. Dioctyl Sodium Sulfosuccinate

Answer 27

SULFONIC ACID DERIVATIVES

Question 28

It is used for external use.

Answer 28

SOAPS

Question 29

Are hydrophilic and form oil in water

Answer 29

ALKALI SOAPS

Question 30

Are water insoluble and form water-in-oil

Answer 30

METALLIC SOAPS

Question 31

Form oil in water

Answer 31

MONOVALENT SOAPS

Question 32

Form water in oil

Answer 32

POLYVALENT SOAPS

Question 33

Are used as surfaced-active agents in 1% concentration.

Answer 33

CATIONIC SYNTHETIC AGENTS

Question 34

Are compatible with soaps

Answer 34

CATIONIC SYNTHETIC AGENTS

Question 35

Ex. Benzalkonium Chloride

Answer 35

CATIONIC SYNTHEITC AGENTS