Nanobiotechnology / Bionanotechnology / Nanobiology
Mah Monir Karimzade; Ladan Rashidi; Fariba Ganji; Mitra Ahmadi; Sattar Tahmasebi Enferadi
Volume 8, Issue 4 , February 2015, , Pages 385-398
Abstract
The aim of this research is the preparation of a system based on mesoporous silica nanoparticles (MSN) for delivery of Rivastigmine hydrogen tartrate and investigating of the system cytotoxicity, with or without drugs, on the human brain neuroblastoma cells (SY5Y). Rivastigmine is a hydrophilic and a ...
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The aim of this research is the preparation of a system based on mesoporous silica nanoparticles (MSN) for delivery of Rivastigmine hydrogen tartrate and investigating of the system cytotoxicity, with or without drugs, on the human brain neuroblastoma cells (SY5Y). Rivastigmine is a hydrophilic and a hydrophobic drug which is used for treatment of Alzimerʾs disease. In this study MSN were synthesized and characterized by scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, x-ray diffraction, N2 adsorption isotherms, and z-potential analysis. Results showed that all MSN were spherical with the same structure. The mean size of nanoparticles was 100±13 nm and the mean diameter of pores was 2.15 nm. The loading capacity and efficiency of rivastigmine hydrogen tartrate were obtained 20.88, and 25%, respectively. Release of rivastigmine from nanoparticles in the simulated gastric and body fluid during 24 h were obtained 70.5 and 79.6%, respectively, which was shown the slightly fast release of rivastigmine in simulated gastric fluid. The cytotoxicity effect of nanoparticles with and without rivastigmine was done by MTT assay on SY5Y cell lines. Results showed that the in vitro rivastigmine release from the nanoparticles containing of it exhibited the more treatment property as free rivastigmine on SY5Y.
Targeted Drug Delivery / Smart Drug Delivery / Drug Targeting
Fariba Ganji; Fateme Hoobakht; Farzane Ghasemi Tahrir; Ebrahim Vasheghani-Farahani
Volume 8, Issue 3 , September 2014, , Pages 249-260
Abstract
Somanis one of the strongest nerve agents and treatment of poisoning with Soman is difficult and time-critical. Pyridostigmine bromide is an inhibitor of cholinesterase used for protecting against toxicity by Soman. In this study, a new injectable thermosensitive sustained release dosage form of pyridostigmine ...
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Somanis one of the strongest nerve agents and treatment of poisoning with Soman is difficult and time-critical. Pyridostigmine bromide is an inhibitor of cholinesterase used for protecting against toxicity by Soman. In this study, a new injectable thermosensitive sustained release dosage form of pyridostigmine bromide was achieved by chitosan/glycerolphosphate solution. In this study, thermosensitivity and rheological properties of chitosan solution (2% w/v) in aqueous hydrochloric acid (0.1 molar) with different percent of glycerolphosphate salt as well as the release profile of pyridostigmine bromide have been investigated. It was observed that increasing the glycerolphosphate salt concentration would increase the pH of chitosan solution, while decrease its gelation time and loss or storage modulus. It was also observed that glycerolphosphate salt concentration has direct effect on hydrogel thermoreversibility. The presented results indicated that hydrogel containing 2% w/v of chitosan and 16% w/v of glycerolphosphate salt could sustain the delivery of pyridostigmine bromide, through Fickian diffusion, up to four days.
