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Direct Voltammetry of Catalase Immobilized on Silica Sol–gel and Cysteine Modified Gold Electrode and Its Application by Junwei Di; Min Zhang; Kaian Yao; Shuping Bi is a Engineering article available to read on EtoBox.

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The direct voltammetry of catalase (CAT) immobilized in silica sol-gel film in the presence of cysteine on gold electrode was investigated. The CAT electrode showed a pair of well-defined and quasi-reversible cyclic voltammetry peaks. It can be used as an electrochemical biosensor for the determination of hydrogen peroxide. The calibration range of H 2 O 2 was from 1 to 30 mol L -1 and the detection limit was 0.4 mol L -1 at a signalto-noise ratio of 3. The interaction of CAT and aluminum ion was also investigated based on the CAT-modified electrode. The electrochemical activity of the CAT-modified electrode was increased with the addition of Al 3+ . The experimental results of voltammetry and fluorescence spectroscopy indicated that the conformation of CAT molecule was altered by the formation of Al-CAT complex with Al 3+ , which may influence the activity of CAT.

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Author

Junwei Di; Min Zhang; Kaian Yao; Shuping Bi

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0956-5663)

Published

2006

Language

EN

Field

Engineering (Physical Sciences)