Impedimetric immunosensor doped with reduced graphene sheets fabricated by controllable electrodeposition for the non-labelled detection of bacteria

被引:132
作者
Wan, Yi [1 ,2 ]
Lin, Zhifeng [1 ,2 ]
Zhang, Dun [1 ]
Wang, Yi [1 ]
Hou, Baorong [1 ]
机构
[1] Chinese Acad Sci, Inst Oceanol, Key Lab Corros Sci, Qingdao 266071, Shandong, Peoples R China
[2] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
基金
中国国家自然科学基金;
关键词
Sulphate-reducing bacteria; Reduced graphene sheets; Electrochemical impedance spectroscopy; Chitosan; Electrodeposition; ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; ESCHERICHIA-COLI O157-H7; RAPID DETECTION; MAGNETIC NANOPARTICLES; BIOSENSOR; SULFATE; ASSAY; QUANTIFICATION; MICROORGANISMS; PROBE;
D O I
10.1016/j.bios.2010.08.008
中图分类号
Q6 [生物物理学];
学科分类号
071011 ;
摘要
A facile, sensitive and reliable impedimetric immunosensor doped with reduced graphene sheets (RGSs) and combined with a controllable electrodeposition technique was developed for the selective detection of marine pathogenic sulphate-reducing bacteria (SRB). The morphology of RGSs and the electrochemical properties of RGSs-doped chitosan (CS) nanocomposite film were investigated by atomic force microscopy. Fourier transform infrared spectroscopy, and cyclic voltammetry (CV). Electrochemical impedance spectroscopy and CV were used to verify the stepwise assembly of the sensor system. Faradic impedance spectroscopy for charge transfer for the redox probe Fe(CN)(6)(3-/4-) was done to determine SRB concentrations. The diameter of the Nyquist diagram that is equal to the charge-transfer resistance (R-ct) increased with increasing SRB concentration. A linear relationship between Rct and SRB concentration was obtained in the SRB concentration range of 1.8 x 10(1) to 1.8 x 10(7) cfu/ml. The impedimetric biosensor gave a distinct response to SRB, but had no obvious response to Vibrio angillarum. It showed a high selectivity for the detection of the pathogen. Based on a combination of the biocompatibility of CS and good electrical conductivity of RGSs, a nanocomposite film with novel architecture was used to immobilize biological and chemical targets and to develop a new type of biosensor. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码:1959 / 1964
页数:6
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