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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 30μmolL ...
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