In the present study an attempt has been made to load Poly (Lactic-Co-glycolic acid) microspheres with
hydroxyapatite (HA) and ofloxacin and propose the composite microspheres to be used as local drug delivery system with
the drug releasing capability for periodontitis treatment. A modified single emulsion method has been used for the preparation
of microspheres. Experiments were conducted to optimize the formulation by RSM-Box-Behnken Method, which is
an independent quadratic design involving three or four independent variables against a pre determined set of dependant
parameters. The particle size of composite microspheres was analyzed and the average size was found to be 22.05 μm.
Photomicrographs and scanning electron micrographs showed that the composite microspheres are spherical in shape and
porous in nature. The microbiological activity of optimized formulation was evaluated using strain: S. aureus-ATCC-
29213 and E. coli–ATCC-25922. In vivo/in situ toxicity evaluation of the formulation was assessed by MTT assay and the
formulation was found to be biocompatible.
Keywords: Drug release, poly (Lactic-Co-glycolic acid), hydroxyapatite, microsphere, cytotoxicity, antibacterial, biocompatible, liquid chromatography (HPLC).
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