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Inclusion of Water Insoluble Drugs in Amorphous Silica Nanoparticles

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Amorphous silica nanoparticles (a-SiNPs) with high surface area and small pore size have been synthesized using a zwitterionic surfactant in acid media. The produced nanoparticles displayed large specific surface area (∼850 m2/g) with an average particles size of 45 nm. The loading efficiency was assessed by incorporating three model water insoluble active substances Carbamazepine (CBZ), Ibuprofen (IBU) and Cyclosporin (CyA) via passive loading and it was found to varying from 15–40%. The loaded silica nanoparticles were analyzed using X-ray powder diffraction (XRPD) and differential scanning calorimetry (DSC) to investigate the state of the adsorbed active agents. CyA was found to be in amorphous state, IBU was partially crystalline while CBZ was transformed into form I. The dissolution profiles showed rapid release for CBZ while IBU and CyA demonstrated prolonged release for 24 hr. The viability of Caco-2 cells was not affected in the presence of a-SiNPs showing negligible cytotoxicity (85%) at high concentrations up to 15 mg/ml.
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Keywords: CYTOTOXICITY; DRUG DISSOLUTION RATES; LOADING; MESOPOROUS SILICA; NANOPARTICLES

Document Type: Research Article

Publication date: 2012-08-01

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  • Journal of Biomedical Nanotechnology (JBN) is a peer-reviewed multidisciplinary journal providing broad coverage in all research areas focused on the applications of nanotechnology in medicine, drug delivery systems, infectious disease, biomedical sciences, biotechnology, and all other related fields of life sciences.
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