Emulsions, Suspensions and Other Dispersions
Emulsions and suspensions are disperse systems. While emulsions are sometimes formulated from oily drugs or nutrient oils, their main function is to provide vehicles for drug delivery in which the drug is dissolved in the oil or water phase. Suspensions, on the other hand, are usually prepared from water-insoluble drugs for delivery orally or by injection, usually intramuscular injection. An increasing number of modern delivery systems are suspensions of liposomes, or of polymer or protein microspheres or nanospheres, hence the need to understand the formulation and stabilisation of these systems. After a general introduction to colloidal systems (disperse systems below about 1 µm in diameter) this chapter will introduce the different types of emulsions, namely.
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