Title: Preventing release in the acidic environment of the stomach via occlusion in ordered mesoporous silica enhances the absorption of poorly soluble weakly acidic drugs
Authors: Van Speybroeck, Michiel
Mellaerts, Randy
Do Thi, Thao
Martens, Johan
Van Humbeeck, Jan
Annaert, Pieter
Van den Mooter, Guy
Augustijns, Patrick # ×
Issue Date: Nov-2011
Publisher: American Chemical Society and American Pharmaceutical Association
Series Title: Journal of Pharmaceutical Sciences vol:100 issue:11 pages:4864-4876
Abstract: This study aimed to assess the pharmaceutical performance of formulations consisting of either indomethacin or glibenclamide and the ordered mesoporous silica material SBA-15. Both compounds were loaded on SBA-15 via solvent impregnation. Adsorption in the SBA-15 mesopores was confirmed using nitrogen physisorption. Differential scanning calorimetry results suggested that both compounds were dispersed monomolecularly onto the SBA-15 surface. In in vitro experiments simulating the gastric-to-intestinal transition, the release of both compounds from SBA-15 remained under 1% in simulated gastric fluid (SGF, pH 1.2), whereas both drugs were completely released within 10 min after transfer to fasted state simulated intestinal fluid (FaSSIF, pH 6.5). As both drugs exhibited very rapid precipitation from the supersaturated state in SGF, the preferential release in FaSSIF—where conditions are more favourable by virtue of either much higher solubility (indomethacin) or more stable supersaturation (glibenclamide)—was considered crucial towards achieving optimal absorption. This hypothesis was confirmed by an in vivo study, where the extent of absorption of a glibenclamide–SBA-15 formulation was found to be more than fourfold higher than that of the commercial glibenclamide product DaonilR
ISSN: 0022-3549
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Drug Delivery and Disposition
Centre for Surface Chemistry and Catalysis
Physical Metallurgy and Materials Engineering Section (-)
× corresponding author
# (joint) last author

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