Nanofabrication of Bio-Self Assembled Monolayer and Its Electrochemical Property for Toxicant Detection
Authors: Singh, Ravindra P.; Kang, Da-Yeon; Choi, Jeong-Woo
Source: Journal of Nanoscience and Nanotechnology, Volume 11, Number 1, January 2011 , pp. 408-412(5)
Publisher: American Scientific Publishers
Abstract:Cyclic voltammetry (CV) has been used to investigate the electrochemical behavior of a glutathione (GSH) self assembled monolayer on modified gold electrodes (Bio-SAM). The GSH monolayer exhibits an influence on electrode surface activity. Electrochemically immobilized dsDNA onto a Cyt c/GSH-SAM/Au electrode, which is useful for the fabrication of a nanobiosensing device. The immobilized Cyt c followed by dsDNA immobilized films maintained its surface activity and finally dsDNA/Cyt c/GSH-SAM/Au electrode, targeted for the detection of toxicants. The films were characterized by CV, DPV, and AFM. The differential pulse voltammetry (DPV) technique was applied to detect three kinds of common toxins, 2-aminoanthracene (2-AA), 3-bromobenzanthrone (3-BBA) and bisphenol A (BPhA). The electrochemical signals showed good inverse relationship with the increase of concentrations of toxicants. Our proposed system based on electrochemical method with nanoscale film technology can be applied at highly sensitive biosensor for detecting various toxic chemicals.
Document Type: Research Article
Publication date: January 1, 2011
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