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Design and In Vitro Characterization of Ilaprazole Microspheres Prepared by Ionotropic Gelation to Increase Bioavailability

Patil Dipak Ashok, Phool Singh Yaduwanshi, Kavita R. Loksh

International Journal of Drug Delivery Technology, 2026

Abstract

Floating microspheres are a promising gastroretentive drug delivery system designed to prolong gastric residence time and improve the bioavailability of drugs with narrow absorption windows, poor intestinal stability, or local action in the stomach. These low-density multiparticulate systems remain buoyant on gastric fluids for extended periods, enabling sustained and controlled drug release. Floating microspheres are commonly prepared using techniques ionotropic gelation method. Ilaprazole-loaded microspheres were prepared by the ionotropic gelation technique using sodium alginate and Eudragit polymers to achieve controlled gastric retention and sustained drug release. The formulated microspheres exhibited satisfactory entrapment efficiency, particle size distribution, buoyancy, and prolonged release characteristics, demonstrating their potential as an effective gastroretentive drug delivery system. Their performance is evaluated based on particle size, buoyancy, drug entrapment efficiency, surface morphology, and in vitro drug release characteristics. Advantages include reduced dosing frequency, enhanced therapeutic efficacy, improved patient compliance, and minimized fluctuations in plasma drug concentrations. The findings suggest that ionotropically gelled Ilaprazole microspheres represent a promising oral drug delivery system capable of enhancing bioavailability, prolonging therapeutic action, and improving patient compliance. Therefore, the developed microsphere…

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