title: Nanofabrication of bio-self assembled monolayer and its electrochemical property for toxicant detection.
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.
authors: Interdisciplinary Program of Integrated Biotechnology, Sogang University, #1 Shinsu-Dong, Mapo-Gu, Seoul 121-742, Korea.
authors: Ravindra P
authors: RP
authors: Singh
authors: Da-Yeon
authors: DY
authors: Kang
authors: Jeong-Woo
authors: JW
authors: Choi
mesh_terms: D000818:Animals; D000873:Anthracenes / Q000032:analysis; D001551:Benz(a)Anthracenes / Q000032:analysis; D001559:Benzhydryl Compounds; D015374:Biosensing Techniques / Q000379:methods*; D045304:Cytochromes c / Q000737:chemistry; D004247:DNA / Q000737:chemistry / Q000378:metabolism; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D005978:Glutathione / Q000737:chemistry; D006046:Gold / Q000737:chemistry; D055767:Immobilized Proteins / Q000737:chemistry; D008567:Membranes, Artificial; D018625:Microscopy, Atomic Force; D008855:Microscopy, Electron, Scanning; D049329:Nanostructures / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods*; D009676:Noxae / Q000032:analysis*; D010084:Oxidation-Reduction; D010636:Phenols / Q000032:analysis; D000098826:Bisphenol A Compounds
chemical_list: D000873:Anthracenes; D001551:Benz(a)Anthracenes; D001559:Benzhydryl Compounds; D045304:Cytochromes c; D004247:DNA; D005978:Glutathione; D006046:Gold; D055767:Immobilized Proteins; D008567:Membranes, Artificial; D009676:Noxae; D010636:Phenols; C477846:3-bromobenzanthrone; C006593:2-anthramine; C006780:bisphenol A; D000098826:Bisphenol A Compounds