Manganese Dioxide Nanostructures as a Novel Electrochemical Mediator for Thiol Sensors

被引：44

作者：

Eremenko, A. V. ^{[3
]}

Dontsova, E. A. ^{[1
]}

Nazarov, A. P. ^{[1
]}

Evtushenko, E. G. ^{[1
]}

Amitonov, S. V. ^{[2
]}

Savilov, S. V. ^{[1
]}

Martynova, L. F. ^{[1
]}

Lunin, V. V. ^{[1
]}

Kurochkin, I. N. ^{[1
]}

机构：

[1] Moscow MV Lomonosov State Univ, Fac Chem, Moscow 119991, Russia

[2] Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119991, Russia

[3] Moscow MV Lomonosov State Univ, Dept Biokinet, AN Belozersky Inst Physicochem Biol, Moscow 119991, Russia

来源：

ELECTROANALYSIS | 2012年 / 24卷 / 03期

关键词：

Butyrylcholinesterase; Diazinon; Electrochemical mediator; Manganese dioxide nanoparticles; Thiols; AMPEROMETRIC DETERMINATION; MNO2; NANOPARTICLES; OXIDATION; DECOMPOSITION; OXIDE; BATTERIES; MECHANISM; ELECTRODE; GLUCOSE;

D O I：

10.1002/elan.201100535

中图分类号：

O65 [分析化学];

学科分类号：

070302 [分析化学];

摘要：

Nanoparticles of various manganese dioxide crystalline modifications (amorphous, beta-phase, and gamma-phase) were compared with respect to their mediator properties in electrochemical detection of thiols. The highest catalytic activity towards thiocholine, cysteine, and glutathione was demonstrated by screen-printed graphite electrodes modified with gamma-MnO2 at the optimized working potential of 450 mV versus the Ag/AgCl reference electrode. High sensitivity of gamma-MnO2 modified electrodes towards thiocholine (345 mA gamma cm2/M) and therefore low detection limit of butyrylcholinesterase (1 pM) enabled their use for subnanomolar detection of an organophosphate pesticide diazinon, an irreversible inhibitor of butyrylcholinesterase. The detection limit for diazinon was estimated as 0.6 nM with assay duration of less than 15 min.

引用

页码：573 / 580

页数：8

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