Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 10, Issue 7, Pages 1094-1097Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2008.05.020
Keywords
glucose oxidase; direct electron transfer; preanodization; disposable; screen-printed carbon electrode
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Here we report the unique property of a preanodized screen-printed carbon electrode (SPCE*) that can allow direct electron transfer (DET) reaction of glucose oxidase (GOx). The GOx can be immobilized in the composite of oxygen functionalities and edge plane sites generated during preanodization without additional cross-linking agents. The electron transfer rate of GOx is greatly enhanced to 4.38 s(-1) as a result of the conformational change of GOx in the microenvironment enabling the accessibility of active site for GOx to the electrode. The analytical versatility is further improved with the aid of Nafion film. As a consequence, the as-prepared electrode can be used as a glucose biosensor and the number of potential foreign species is then restricted by molecular size, permeation and/or (bio)chemical reaction. Most importantly, the disposable nature of the proposed electrode is expected to promote the DET-related researches. (C) 2008 Elsevier B.V. All rights reserved.
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