PURPOSE: Alendronate sodium, used systemically as a bone protective agent, proved to also be effective locally in various dental bone applications. Development of alendronate-loaded microspheres with high loading efficiency for such applications would be greatly challenged by the hydrophilicity and low MW of the drug. The aim of this study was to incorporate alendronate sodium, into poly (lactide-co-glycolide) (PLGA) microspheres (MS) with high loading efficiency. METHODS: Three multiple emulsion methods: water-in-oil-in-water (W/O/W), water-in-oil-in-oil (W/O(1)/O(2)) and solid-in-oil-in-oil (S/O(1)/O(2)) were tested. In addition to entrapment efficiency, MS were characterized for surface morphology, particle size, in vitro drug release and in vitro degradation of the polymer matrix. Alendronate microspheres with maximum drug loading and good overall in vitro performance were obtained using the W/O(1)/O(2) emulsion technique. RESULTS: Drug release from the microspheres exhibited a triphasic release pattern over a period of 13 days, the last fast release phase being associated with more rapid degradation of the PLGA matrix. CONCLUSIONS: Biocompatible, biodegradable PLGA microspheres incorporating alendronate sodium with high loading efficiency obtained in this study may offer promise as a delivery system for bisphosphonates in dental and probably other clinical applications.
PURPOSE:Alendronate sodium, used systemically as a bone protective agent, proved to also be effective locally in various dental bone applications. Development of alendronate-loaded microspheres with high loading efficiency for such applications would be greatly challenged by the hydrophilicity and low MW of the drug. The aim of this study was to incorporate alendronate sodium, into poly (lactide-co-glycolide) (PLGA) microspheres (MS) with high loading efficiency. METHODS: Three multiple emulsion methods: water-in-oil-in-water (W/O/W), water-in-oil-in-oil (W/O(1)/O(2)) and solid-in-oil-in-oil (S/O(1)/O(2)) were tested. In addition to entrapment efficiency, MS were characterized for surface morphology, particle size, in vitro drug release and in vitro degradation of the polymer matrix. Alendronate microspheres with maximum drug loading and good overall in vitro performance were obtained using the W/O(1)/O(2) emulsion technique. RESULTS: Drug release from the microspheres exhibited a triphasic release pattern over a period of 13 days, the last fast release phase being associated with more rapid degradation of the PLGA matrix. CONCLUSIONS: Biocompatible, biodegradable PLGA microspheres incorporating alendronate sodium with high loading efficiency obtained in this study may offer promise as a delivery system for bisphosphonatesin dental and probably other clinical applications.
Authors: Raphael Mietzner; Christian Kade; Franziska Froemel; Diana Pauly; W Daniel Stamer; Andreas Ohlmann; Joachim Wegener; Rudolf Fuchshofer; Miriam Breunig Journal: Pharmaceutics Date: 2020-07-27 Impact factor: 6.321
Authors: Małgorzata Krok-Borkowicz; Katarzyna Reczyńska; Łucja Rumian; Elżbieta Menaszek; Maciej Orzelski; Piotr Malisz; Piotr Silmanowicz; Piotr Dobrzyński; Elżbieta Pamuła Journal: Int J Mol Sci Date: 2020-10-13 Impact factor: 5.923
Authors: Zhengjie Lin; Danni Shen; Weixiao Zhou; Yufeng Zheng; Tiantian Kong; Xuanyong Liu; Shuilin Wu; Paul K Chu; Ying Zhao; Jun Wu; Kenneth M C Cheung; Kelvin W K Yeung Journal: Bioact Mater Date: 2021-01-23