Formulation Optimization and In Vitro Characterization of Granisetronloaded
Polylactic-co-glycolic Acid Microspheres Prepared by a
Dropping-in-liquid Emulsification Technique

Atef    Mohammed Qasem    Ahmed; Li-Qing       Chen; Huan-Huan       Du; Wei       Sun; Qing-Ri       Cao

doi:10.2174/1567201818666210729111646

Abstract

Purpose: Traditional dosage forms of granisetron (GRN) decrease patient compliance associated with repeated drug administration because of the short half-life of the drug.

Methods: In this study, novel GRN-loaded Polylactic-co-glycolic Acid (PLGA) sustained-release microspheres were prepared for the first time via a dropping-in-liquid emulsification technique. The effects of various factors, such as pH of the outer phase, Tween 80, Polyvinyl Alcohol (PVA) concentrations, and hardening process, on the Encapsulation Efficiency (EE), Drug Loading (DL), and particle size of microspheres were extensively studied. The physicochemical properties, including drug release, surface morphology, crystallinity, thermal changes, and molecular interactions, were also studied.

Results: GRN has a pH-dependent solubility and it exhibits a remarkably high solubility under acidic condition. The EE of the alkaline medium (pH 8) was higher than that of the acidic medium (pH 4.0). EE and DL decreased in the presence of Tween 80 in the outer phase, whereas EE significantly increased during hardening. The particle size of microspheres was not affected by PVA and Tween 80 concentrations, but it was influenced by PVA volume and hardening. X-ray diffraction and differential scanning calorimetry results showed that the physical state of the drug changed from a crystalline form to an amorphous form, thereby confirming that the drug was encapsulated into the PLGA matrix. Fourier transform-infrared spectroscopy confirmed that some molecular interactions occurred between the drug and the polymer. GRN-loaded PLGA microspheres showed sustained release profiles of over 90% on week 3.

Conclusion: GRN-loaded PLGA microspheres with sustained-release were successfully prepared, and they exhibited a relatively high EE without Tween 80 as an emulsifier and with the hardening process.

Keywords: Granisetron, polylactic-co-glycolic acid, microspheres, dropping-in-liquid emulsification, sustained release, characterization.

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DOI https://dx.doi.org/10.2174/1567201818666210729111646	Print ISSN 1567-2018
Publisher Name Bentham Science Publisher	Online ISSN 1875-5704

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Formulation Optimization and In Vitro Characterization of Granisetronloaded Polylactic-co-glycolic Acid Microspheres Prepared by a Dropping-in-liquid Emulsification Technique

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