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Development of a Detection Kit Based on G-Quadruplex DNAzyme for Detection of Lead(II) Ion in Food Samples

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Abstract

The biocatalytic function of G-quadruplex DNAzyme has been first used to design a detection kit for colorimetric detection of Pb2+ in food samples by coupling guaiacol (GA) as an effective and ideal colorimetric signal indicator. Addition of Pb2+ enabled the G-rich DNA to bind hemin to fabricate the Pb2+-promoted DNAzyme, which can catalyze the H2O2-mediated oxidation of colorless GA to produce amber tetraguaiacol, causing a visible color change. Both standard curve and colorimetric card were constructed in the present detection kit for the quantitative analysis of Pb2+. Under optimum conditions, the working range of the kit was 10–100 nM with a detection limit of 1 nM Pb2+. And the performance of the colorimetric card method of the kit could discriminate Pb2+ from 5 to 80 nM. The shelf-life of the kit was 6 months at 4 °C, and the effectiveness and reliability of the kit on the determination of Pb2+ were evaluated in real food samples. Therefore, the good performance characteristics of the DNAzyme-based detection kit indicate that it holds a promising application for sensitive and low-cost detection of Pb2+ ions in foods.

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Acknowledgments

This work is supported by National Science & Technology Pillar Program (2012BAK17B06), National Natural Science Foundation of China (No. 31101274, No. 31201357), the Shaanxi Provincial Research Fund (2014K13-10, 2012KJXX-17, 2014KJXX-42, 2014K02-13-03), Open Fund of State Key Laboratory of Electroanalytical Chemistry (SKLEAC201301), Fundamental Research Funds for the Northwest A&F University of China (2014YB093), and Program for New Century Excellent Talents in University (NCET-13-0483).

Conflict of Interest

Tao Liu declares that he has no conflict of interest. Gang Nie declares that he has no conflict of interest. Xiao Zhang declares that she has no conflict of interest. Wei Liu declares that he has no conflict of interest. Wentao Zhang declares that he has no conflict of interest. Yashan Wang declares that she has no conflict of interest. Daohong Zhang declares that she has no conflict of interest. Jianlong Wang declares that he has no conflict of interest. This article does not contain any studies with human or animal subjects.

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Correspondence to Daohong Zhang or Jianlong Wang.

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Both Tao Liu and Gang Nie rank as the first authors.

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Liu, T., Nie, G., Zhang, X. et al. Development of a Detection Kit Based on G-Quadruplex DNAzyme for Detection of Lead(II) Ion in Food Samples. Food Anal. Methods 8, 1133–1140 (2015). https://doi.org/10.1007/s12161-014-9990-8

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  • DOI: https://doi.org/10.1007/s12161-014-9990-8

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