DESIGN AND DEVELOPMENT OF INVITRO RELEASE MUCOADHESIVE MICROSPHERES EMBEDDED CLERODENDRUM PHLOMIDIS (CP) EXTRACT FOR PROLONGED ANTIDIABETIC ACTIVITY

K. Jesindha Beyatricks*, S. Kavimani, N. Habeela Jainab, Manvitha K. and Madhuri Sarode

ABSTRACT

In this study an attempt was made to prepare mucoadhesive microcapsules of clerodendrum phlomidis extract using alginate polymers for prolonged release. Encapsulation of extract into sodium alginate polymer was done by ionic-gelation technique. The microcapsules were evaluated for surface morphology and particle shape by scanning electron microscope. Microcapsules were also evaluated for their microencapsulation efficiency, in vitro wash-off mucoadhesion test and in vivo study. The microcapsules were discrete, spherical and free flowing. The microencapsulation efficiency was in the range of 60–70% and microcapsules exhibited good mucoadhesive property in the in vitro wash off test. Extract loading and entrapment efficiency was increased with increasing the concentration of polymer. The percentage of microcapsules adhering to tissue at pH 7.4 after 6 h varied from 20–30%, whereas the percentage of microcapsules adhering to tissue at pH 1.2 after 6 h varied from 40–60%. In vivo testing of the mucoadhesive microcapsules in diabetic albino rats demonstrated significant antidiabetic effect of extract. The hypoglycemic effect obtained by mucoadhesive microcapsules was for more than 16 h whereas plain CP extract produced an antidiabetic effect for only 4 h suggesting that mucoadhesive microcapsules are a valuable system for the long term delivery of CP extract.

Keywords: Microspheres, Mucoadhesive, Ionic gelation technique, Microencapsulation.