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• W2043281058 abstract "Sol–gel technique has been used for the covalent immobilization of the water-soluble mediator, thionin to construct a bulk modified, leak free composite electrode. This renewable composite electrode provides stable immobilization matrix for thionin via glutaraldehyde crosslinking. In the electrode composition the sol–gel precursor 3-aminopropyltrimethoxy silane serves as the host for immobilization of thionin, thereby preventing its leakage. An additional precursor methyl trimethoxy silane endows hydrophobicity and limits the wetting section of the modified electrode. Cyclic voltammetric characterization of the modified electrode in the potential range of 0.2 to −0.6 V exhibited stable redox peaks with a formal potential of −0.273 V, corresponding to immobilized thionin. This chemically modified electrode exhibits good electrocatalytic activity for the reduction of H2O2 at a lower potential of −0.35 V. The reduction current of the modified electrode increases linearly in the range of 3.44 × 10−6 M to 3.07 × 10−3 M H2O2 with a detection limit of 1.38 × 10−6 M. The stable and quick response (5 s) during chronoamperometry shows the potential application of the modified electrode for flow system analysis. The low potential operation (−0.35 V) favoured selective determination of H2O2. The composite electrode exhibits distinct advantages of polishing in the event of surface fouling as well as simple preparation, good chemical and mechanical stability, economical and remarkable long-term stability (more than 1 year). The applicability of the present sensor for H2O2 determination proposes a method for the detection of other biologically significant analytes." @default.
• W2043281058 created "2016-06-24" @default.
• W2043281058 creator A5005929174 @default.
• W2043281058 creator A5040108669 @default.
• W2043281058 date "2007-12-01" @default.
• W2043281058 modified "2023-10-11" @default.
• W2043281058 title "Surface renewable sol–gel composite electrode derived from 3-aminopropyl trimethoxy silane with covalently immobilized thionin" @default.
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• W2043281058 doi "https://doi.org/10.1016/j.bios.2007.06.003" @default.
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