Journal
ANALYTICA CHIMICA ACTA
Volume 752, Issue -, Pages 39-44Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2012.09.009
Keywords
Vibrio parahaemolyticus; Carboxyl functionalized graphene oxide; Ploy-L-lysine; Glassy carbon electrode; Electrochemical deoxyribonucleic acid biosensor
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Funding
- National Natural Science Foundation of China [21075071]
- Research Project of the General Administration of Quality Supervision, Inspection and Quarantine of PR China [2012IK175]
- Shandong Province Natural Science Foundation [ZR2009BL017]
- Foundation of Hainan Normal University
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A carboxyl functionalized graphene oxide (GO-COOH) and electropolymerized ploy-L-lysine (PLLy) modified glassy carbon electrode (GCE) was fabricated and used for the construction of an electrochemical deoxyribonucleic acid (DNA) biosensor. The NH2 modified probe ssDNA sequences were immobilized on the surface of GO-COOH/PLLy/GCE by covalent linking with the formation of amide bonds, which was stable and furthur hybridized with the target ssDNA sequence. Differential pulse voltammetry (DPV) was used to monitor the hybridization events with methylene blue as electrochemical indicator, which gave a sensitive reduction peak at -0.287 V (vs. SCE). Under the optimal conditions the reduction peak current was proportional to the concentration of tlh gene sequence in the range from 1.0 x 10(-12) to 1.0 x 10(-6) mol L-1 with a detection limit as 1.69 x 10(-13) mol L-1 (3 sigma). The polymerase chain reaction products of tlh gene from oyster samples were detected with satisfactory results, indicating the potential application of this electrochemical DNA sensor. (c) 2012 Elsevier B.V. All rights reserved.
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