A rapid and solid sampling colorimetric sensor of Hg in food based on thermo-release coupled with Au nanozyme trap

文献类型： 外文期刊

第一作者： Chai, Weiwei

作者： Chai, Weiwei;Liu, Tengpeng;Huang, Xudong;He, Qianli;Li, Xue;Liu, Jixin;Mao, Xuefei;Chai, Weiwei;Liu, Tengpeng;Huang, Xudong;He, Qianli;Li, Xue;Liu, Jixin;Mao, Xuefei;Liu, Jixin;Liu, Tengpeng

作者机构：

关键词： Solid sampling colorimetry; Nanozyme-based colorimetry; Gas phase enrichment; Au nanozymes; Mercury; Food

期刊名称：FOOD CONTROL （ 影响因子：6.3； 五年影响因子：6.1 ）

ISSN： 0956-7135

年卷期： 2025 年 169 卷

页码：

收录情况： SCI

摘要： Considering complicated matrices, solid sampling analysis of heavy metals in food is almost impossible for ionic nanocolorimetric methods. Here, a novel approach is proposed to fulfill Hg analysis in solid sample based on Au nanozyme colorimetry following thermo-release (TR) and gas phase enrichment (GPE). Gold nanozyme was synthesized to both enable Hg trapping and nanozyme reaction. Furthermore, the presence of Hg-0 enhances the POD activity of Au nanozymes and thereby oxidizes TMB under H2O2, resulting in color change to blue. The method LOD370 for Hg reached 6 mu g/kg in 200 mg rice sample with a good linearity (R-2 > 0.995); the analysis time was less than 25 min excluding digestion or extraction. Mg2+, Fe3+, and Cr- interference was effectively eliminated via thermo-release, GPE and AuNPs amalgamation. It was for the first time rapid and colorimetric detection of Hg in solid sample was achieved for nanozyme, holding a great potential for visualized elemental detection in food.

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