A microfluidic electrochemical device for high sensitivity biosensing: detection of nanomolar hydrogen peroxide.

A microfluidic electrochemical device for high sensitivity biosensing: detection of nanomolar hydrogen peroxide.
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DOI:
10.1016/j.elecom.2009.02.002
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发表时间:
2009-04-01
影响因子:
5.4
通讯作者:
Rusling JF
Rusling JF
中科院分区:
工程技术3区
文献类型:
--
作者:
Chikkaveeraiah BV;Liu H;Mani V;Papadimitrakopoulos F;Rusling JF

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We report herein a simple device for rapid biosensing consisting of a single microfluidic channel made from poly(dimethylsiloxane) (PDMS) coupled to an injector, and incorporating a biocatalytic sensing electrode, reference and counter electrodes. The sensing electrode was a gold wire coated with 5 nm glutathione-decorated gold nanoparticles (AuNPs). Sensitive detection of H2O2 based on direct bioelectrocatalysis by horseradish peroxidase (HRP) was used for evaluation. HRP was covalently linked the glutathione-AuNPs. This electrode presented quasi-reversible cyclic voltammetry peaks at −0.01 V vs Ag/AgCl at pH 6.5 for the HRP heme FeIII/FeII couple. Direct electrochemical activity of HRP was used to detect H2O2 at high sensitivity with a detection limit of 5 nM in an unmediated system.
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