Journal
TALANTA
Volume 117, Issue -, Pages 127-132Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2013.08.053
Keywords
BSA-Au clusters; Hg2+; Peroxidase-like activity; Detection
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Funding
- National Basic Research Program of China [2011CB933600]
- National Natural Science Foundation of China [21175110]
- Natural Science Foundation Project of CQ CSTC [2010BB4004]
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It was found that Hg2+ can inhibit the peroxidase mimetic activity of bovine serum albumin (BSA) protected Au clusters (BSA-Au) due to the specific interaction between Hg2+ and Au+ existed onto the surface of BSA-Au clusters. By coupling with 3, 3', 5, 5'-tetramethylbenzidine (TMB)-H2O2 chromogenic reaction, a novel method for Hg2+ detection was developed based on the inhibiting effect of Hg2+ on BSA-Au clusters peroxidase-like activity. This method exhibited high selectivity and sensitivity. As low as 3 nM (0.6 ppb, 3 sigma) Hg2+ could be detected with a linear range from 10 nM (2 ppb) to 10 mu M (2 ppm) and this method was successfully applied for the determination of total mercury content in skin lightening products. (C) 2013 Elsevier B.V. All rights reserved.
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