PHT231-Lec 9 & 10

The most suitable dosage form for intravenous lipid nutrients is.....

• Oily solution

• O/W emulsion

• W/O emulsion

• O/W/O

The above figure represents ...........

• Electric double layer

• DLVO theory

• Effect of electrolytes on suspension stability

• Effect of electrolytes on emulsion stability

Hard cake is formed at region ........

• 1

• 2

• 3

• 2 & 3

Flocculated suspension is formed in the following region......

• 1

• 2

• 3

• 2&3

Flocculated suspension is pharmaceutically preferred because ....

• The sediment size is large

• The sediment is easy to re-dispersed

• The supernatant is clear

• The sediment size is small

The following figure represents the gradual addition of potassium phosphate to a positively charged drug suspension to increase its stability.

Carefully examine the graph and answer

Graph A represents the relationship between ................ and the concentration of potassium phosphate.

• Degree of flocculation

• Viscosity of the suspension

• Zeta potential

• Sediment height

The following figure represents the gradual addition of potassium phosphate to a positively charged drug suspension to increase its stability. Carefully examine the graph and answer

1.     Graph B represents the relationship between ................ and the concentration of potassium phosphate.

• Degree of flocculation

• Viscosity of the suspension

• Zeta potential

• Sediment height

The following figure represents the gradual addition of potassium phosphate to a positively charged drug suspension to increase its stability. Carefully examine the graph and answer

*Which of the following zones represents the formation of a flocculated suspension?

• C

• D

• E

• C and E

The following figure represents the gradual addition of potassium phosphate to a positively charged drug suspension to increase its stability. Carefully examine the graph and answer

*The role of potassium phosphate in the formulation of the suspension is......

• Wetting agent

• Flocculating agent

• Suspending agent

• Emulsofying agent

Non-ionic surfactants act as flocculating agents by....

• Micelle formation

• Bridging between particles

• Decreasing zeta potential

• Bridging between particles and decreasing zeta potential