Preparation and in vitro and in vivo evaluation of glipizide mucoadhesive microspheres using factorial design

Abstract

The purpose of the research was to prepare controlled release glipizide mucoadhesive microspheres with a coat consisting of sodium alginate and a mucoadhesive polymer Carbopol 971P. Orificeionic gelation method by using 3² factorial design were investigated with a view to develop mucoadhesive microspheres of controlled release. The resulting microspheres were discrete, free flowing, spherical and multinucleate monolithic type. Microencapsulation efficiency was in the range of 56-88%. Microspheres exhibit good mucoadhesive property in the falling film test. Glipizide release from the mucoadhesive microspheres was slow and extended over long period of time. Drug release was non-Fickian type. The concentration of carbopol 971P and sodium alginate had a more significant effect on different variables. In-vivo testing demonstrated a significant hypoglycemic effect of glipizide