In this study, calcium alginate microspheres were prepared by an emulsification method using surfactants. A blend of sorbitan trioleate and polyoxyethylene sorbitan trioleate of varying HLB was used to produce the microspheres. The results obtained showed that the surfactant concentration and HLB played an important role in the formation of the microspheres. The size, size distribution and to a certain extent the shape were significantly affected by the HLB. However, HLB did not alter the drug encapsulation efficiency appreciably but did affect the rate of drug release. © 1993.
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