Polyoxometalates as promising enzyme mimics for the sensitive detection of hydrogen peroxide by fluorometric method

Publication date: 1 October 2018
Source:Talanta, Volume 188
Author(s): Rui Tian, Boyu Zhang, Mingming Zhao, Qiang Ma, Yanfei Qi
Polyoxometalates (POMs) have been proven to possess intrinsic peroxidase-like activity. However, by far, most of POMs with intrinsic peroxidase-like activity are stable at acid aqueous. Herein, we firstly utilized Na10[α-SiW9O34] with the peroxidase-like property in basic pH condition to build a CdTe quantum dots (QDs)-based fluorometric method for detection of hydrogen peroxide. In the CdTe QDs stable pH value, Na10[α-SiW9O34] can catalyze the decomposition of H2O2 into·OH radicals that could efficiently quench the fluorescence of CdTe QDs. The limit of detection in this system were 3.8 nmol/L. The RSD of detection were range from 0.88% to 2.78%. And the linear range of H2O2 is from 7.8 × 10⁻⁹ to 2.5 × 10⁻⁷ mol/L. The rate of recovery of sample addition was between 93.99% and 110.02%. The results not only built a simple, sensitive and easy handing assay but also enlarge the POMs' analytic application field.

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