A simple electrochemical approach to fabricate a glucose biosensor based on graphene-glucose oxidase biocomposite.

Binesh Unnikrishnan, Selvakumar Palanisamy, Shen-Ming Chen

Electroanalysis and Bioelectrochemistry Laboratory, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan, ROC.

Biosensors & bioelectronics 2013 Jan 15

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We report a simple electrochemical approach for the immobilization of glucose oxidase (GOx) on reduced graphene oxide (RGO). The immobilization of GOx was achieved in a single step without any cross linking agents or modifiers. A simple solution phase approach was used to prepare exfoliated graphene oxide (GO), followed by electrochemical reduction to get RGO-GOx biocomposite. The direct electrochemistry of GOx was revealed at the RGO-GOx modified glassy carbon electrode (GCE). The electrocatalytic and electroanalytical applications of the proposed film were studied by cyclic voltammetry (CV) and amperometry. It is notable that the glucose determination has been achieved in mediator-free conditions. RGO-GOx film showed very good stability, reproducibility and high selectivity. The developed biosensor exhibits excellent catalytic activity towards glucose over a wide linear range of 0.1-27mM with a sensitivity of 1.85μAmM(-1)cm(-2). The facile and easy electrochemical approach used for the preparation of RGO-GOx may open up new horizons in the production of cost-effective biosensors and biofuel cells. Copyright © 2012 Elsevier B.V. All rights reserved.

Citation

Binesh Unnikrishnan, Selvakumar Palanisamy, Shen-Ming Chen. A simple electrochemical approach to fabricate a glucose biosensor based on graphene-glucose oxidase biocomposite. Biosensors & bioelectronics. 2013 Jan 15;39(1):70-5