V2O5 nanowires with an intrinsic peroxidase-like activity

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Abstract

V2O5 nanowires exhibit an intrinsic catalytic activity towards classical peroxidase substrates such as 2,2-azino-bis(3- ethylbenzothiazoline-6-sulfonic acid) (ABTS) and 3,3,5,5,-tetramethylbenzdine (TMB) in the presence of H2O2. These V2O 5 nanowires show an optimum reactivity at a pH of 4.0 and the catalytic activity is dependent on the concentration. The Michaelis-Menten kinetics of the ABTS oxidation over these nanowires reveals a behavior similar to that of their natural vanadium-dependent haloperoxidase (V-HPO) counterparts. The V2O5 nanowires mediate the oxidation of ABTS in the presence of H2O2 with a turnover frequency (k cat) of 2.5 × 103 s-1. The KM values of the V2O5 nanowires for ABTS oxidation (0.4 μ) and for H2O2 (2.9 μ) at a pH of 4.0 are significantly smaller than those reported for horseradish peroxidases (HRP) and V-HPO indicating a higher affinity of the substrates for the V2O 5 nanowire surface. Based on the kinetic parameters and similarity with vanadium-based complexes a mechanism is proposed where an intermediate metastable peroxo complex is formed as the first catalytic step. The nanostructured vanadium-based material can be re-used up to 10 times and retains its catalytic activity in a wide range of organic solvents (up to 90%) making it a promising mimic of peroxidase catalysts. V2O5 nanowires show an intrinsic catalytic activity towards classical peroxidase of substrates such as 2,2-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) and 3,3,5,5,-tetramethylbenzadine (TMB) in the presence of H2O 2. The Michaelis-Menten kinetics of the ABTS oxidation over these nanowires reveal behavior that is similar to that of their natural vanadium-dependent haloperoxidase (V-HPO) counterparts. The nanostructured vanadium-based material can be re-used up to 10 times and retains its catalytic activity making it a promising mimic of peroxidase catalysts. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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André, R., Natálio, F., Humanes, M., Leppin, J., Heinze, K., Wever, R., … Tremel, W. (2011). V2O5 nanowires with an intrinsic peroxidase-like activity. Advanced Functional Materials, 21(3), 501–509. https://doi.org/10.1002/adfm.201001302

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