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• W1973998725 abstract "Hybrid mesoporous silica nanoparticles (MSNs) modified with polymer polyethylene glycol (PEG) through the biodegradable disulfide bonds were prepared to achieve ‘on demand’ drug release. In this system, PEG chains were chosen as the representative gatekeepers that can block drugs within the mesopores of MSNs. After the addition of glutathione (GSH), the gatekeepers were removed from the pore outlets of MSNs, followed by the release of encapsulated drugs. In this research, the effects of grafting density of gatekeepers on the drug release and biocompatibility of silica carriers were also investigated. First, PEG modified MSNs were prepared by the condensation reaction between the carboxyl groups of MSN and the hydroxyl of PEG. The structure of the resultant MSN-SS-PEG was characterized by transmission electron microscopy (TEM), nitrogen adsorption/desorption isotherms analysis and Fourier transform infrared spectroscopy (FTIR). Rhodamine B (RhB) as the model drug was loaded into MSNs. The in vitro assay results indicated that RhB was released rapidly after the addition of 10 mM GSH; M1-SS-PEG had the best capping efficiency compared with M0.5 and M1.5 groups. Moreover, hemolysis assay, serum protein adsorption and cell viability test indicated that with the increase of PEG grafting density, the biocompatibility of silica carriers increased." @default.
• W1973998725 created "2016-06-24" @default.
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• W1973998725 date "2015-05-01" @default.
• W1973998725 modified "2023-10-12" @default.
• W1973998725 title "Redox-responsive mesoporous silica as carriers for controlled drug delivery: A comparative study based on silica and PEG gatekeepers" @default.
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• W1973998725 doi "https://doi.org/10.1016/j.ejps.2015.02.008" @default.
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