期刊
BIOSENSORS & BIOELECTRONICS
卷 45, 期 -, 页码 181-188出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2012.12.055
关键词
Biocompatibility; Biofunctionalization; Genosensor; Nanostructured MgO-Chitosan; Vibrio cholerae
类别
资金
- CSIR, India
- TSDP-DST
- CSIR empower project
A novel organic-inorganic platform comprising of chitosan (CH) modified nanostructured magnesium oxide (nanoMgO) has been electrophoretically deposited on the indium-tin-oxide (ITO) substrate. The single stranded probe DNA (ssDNA) sequence of Vibrio cholerae has been covalently functionalized onto CH-nanoMgO/ITO surface. The cytotoxicity assay of nanoMgO particles, examined using human intestinal cell line (INT 407), reveals no significant cytotoxicity at the given doses in the range of 50-350m/mu L. The X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and various microscopic techniques have been employed for the structural and morphological analysis of the fabricated electrodes. The electrochemical response studies of ssDNA and fragmented genomic DNA hybridized electrode (dsGDNA/CH-nanoMgO/ITO) have been carried out using cyclic voltammetry (CV) and differential pulse voltammetly (DPV) techniques. The dsGDNA/CH-nanoMgO/ITO bioelectrode exhibits a linear response in the range 100-500 ng/mu L. with improved sensitivity of 36.72 nA/ng/cm(2), faster response time of 3 s and high stability of 3-4 months under refrigerated condition. The lower detection limit of fabricated genosensor has been estimated as 35.20 ng/mu L and it shows good reproducibility/repeatability. (C) 2013 Elsevier B.V. All rights reserved.
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