1. Suspension containing diffusible solids: • The drug is finely powdered with other ingredients. • 3/4th of the vehicle is added to make cream. • Addition of rest of vehicle. • Volume is makeup. • Suspension is l…
1. Natural polysaccharides (a) Acacia: Protective colloid and suspending agent used in a preparation containing resinous tincture that precipitates on the addition of water. (b) Tragacanth: Better than acacia, used to suspe…
1. Suspension is usually applicable for a drug that is insoluble or poorly soluble e.g. Prednisolone syrup. 2. To prevent degradation of the drug or to remove stability of the drug e.g. Oxytetracycline suspension. 3. To mas…
Flocculated Suspension Deflocculated Suspension 1. Particles exist as loose aggregates. 1. Particles exist as separate entities. 2. The rate of sedimentation is high. …
Suspensions are biphasic, heterogeneous systems in which finely divided insoluble solid particles (disperse phase) are dispersed or suspended in a vehicle (dispersion medium). • The diameter of disperse phase may range from 0.5…
Stability testing of emulsions involves determining stability at long-term storage conditions, accelerated storage conditions, and freezing and thawing conditions. Stress conditions are applied in order to speed up the stability …
In the case of two immiscible liquids, the cohesive force between the molecules of each separate liquid exceeds the adhesive force between two liquids. This is manifested as interfacial energy or tension at the boundary between t…