Bioelectrocatalytic Reduction of Hydrogen Peroxide by Microperoxidase-11 Immobilized on Mesoporous Antimony-Doped Tin Oxide

被引：14

作者：

Neumann, Bettina ^{[1
]}

Kielb, Patrycja ^{[2
]}

Rustam, Lina ^{[3
]}

Fischer, Anna ^{[3
]}

Weidinger, Inez M. ^{[2
,4
]}

Wollenberger, Ulla ^{[1
]}

机构：

[1] Univ Potsdam, Inst Biochem & Biol, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany

[2] Tech Univ Berlin, Inst Chem, Str 17 Juni 135, D-10623 Berlin, Germany

[3] Univ Freiburg, Inst Inorgan & Analyt Chem, Albertstr 21, D-79104 Freiburg, Germany

[4] Tech Univ Dresden, Dept Chem & Food Chem, Helmholtzstr 10, D-01069 Dresden, Germany

来源：

CHEMELECTROCHEM | 2017年 / 4卷 / 04期

关键词：

electrochemistry; enzyme catalysis; mesoporous materials; microperoxidase; spectroelectrochemistry; DIRECT ELECTRON-TRANSFER; MONOLAYER-FUNCTIONALIZED ELECTRODES; ELECTROCATALYTIC REDUCTION; DIRECT ELECTROCHEMISTRY; GOLD ELECTRODE; CYTOCHROME-C; HEME; CARBON; INACTIVATION; SOLVENTS;

D O I：

10.1002/celc.201600776

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The heme-undecapeptide microperoxidase-11 (MP-11) was immobilized on mesoporous antimony-doped tin oxide (ATO) thin-film electrodes modified with the positively charged binding promotor polydiallyldimethylammonium chloride. Surface concentrations of MP-11 of 1.5 nmol cm(-2) were sufficiently high to enable spectroelectrochemical analyses. UV/Vis spectroscopy and resonance Raman spectroscopy revealed that immobilized MP-11 adopts a six-coordinated low-spin conformation, as in solution in the presence of a polycation. Cathodic reduction of hydrogen peroxide at potentials close to +500mV versus Ag/AgCl indicates that the reaction proceeds via a Compound I-type like intermediate, analogous to natural peroxidases, and confirms mesoporous ATO as a suitable host material for adsorbing the heme-peptide in its native state. A hydrogen peroxide sensor is proposed by using the bioelectrocatalytic properties of the MP-11-modified ATO.

引用

页码：913 / 919

页数：7

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