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• W2167024339 abstract "Therapeutic nanosystems based on magnetic mesoporous silica nanoparticles are successfully obtained by a facile, reproducible and time-saving sonochemical method. Hydrophilic citrate-capped magnetite nanoparticles of about 20 nm are firstly prepared by ultrasound-assisted chemical precipitation. Secondly, freshly-dried magnetite nanoparticles are coated with mesoporous silica shell by sonochemically-modified Ströber method. The applied procedure provides easily-separable, stable core-shell nanoparticles consisting of superparamagnetic Fe3O4 cores and mesoporous silica shell. SEM micrographs showed that core-shell nanoparticles are smaller than 400 nm, a prerequisite for biomedical applications by intravenous administrations. Further, these sonochemically prepared magnetic nanoparticles are employed as biocompatible matrices to host and deliver 5-fluorouracil, a highly-toxic low-molecular antimetabolite chemotherapeutic drug. For this, drug molecules are confined into unmodified and amino-modified mesopores of the silica shell by adsorption from alcoholic solutions. A detailed study was performed using XRD, N2-sorption measurements, SEM and FTIR spectroscopy with the primary goal of investigating possible structural, textural and morphological modifications aroused after pore-functionalization and drug nanoconfinement. Magnetic behavior of prepared therapeutic nanosystems is visualized using vibrating sample magnetometry (VSM). Finally, the release profile of 5-fluorouracil from the unmodified and amino-modified nanoparticulate magnetic matrices in PBS solution (pH 7.4) is followed by means of liquid chromatographic measurements. The HPLC method used for determination of 5-fluoruracil in releasing media was fully validated in house, in terms of specificity, linearity, precision, LOD and LOQ establishment." @default.
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• W2167024339 date "2013-04-04" @default.
• W2167024339 modified "2023-09-26" @default.
• W2167024339 title "Sonochemical Development of Magnetic Nanoporous Therapeutic Systems as Carriers for 5-Fluorouracil " @default.
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• W2167024339 doi "https://doi.org/10.12974/2311-8792.2013.01.01.4" @default.
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