SBA-15 type ordered silicas possessing amino groups attached onto their surfaces were prepared by using two
different functionalization methodologies. These matrices were used for the cephalexin adsorption from aqueous solution
and further kinetic study of its release into physiological solution. The materials were characterized by nitrogen adsorption/
desorption, scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR), X-Ray photoelectron
spectrometry (XPS) and thermo analytical methods (TG/DSC). UV–visible spectroscopy at 262 nm was used for
quantitative determination of cephalexin present in liquid media. Results reveal that drug adsorption capacities and the
corresponding release profiles are dependent on the number of loaded amino groups and their location, which in turn is
determined by the functionalization procedure used. It was concluded that amino post-functionalization could enhance
long-term cephalexin delivery in comparison with co-functionalization procedure.
Keywords: SBA-15, mesoporous silicas, surface functionalization, drug adsorption, drug release, cephalexin.
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