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Specific colorimetric detection of methylmercury based on peroxidase-like activity regulation of carbon dots/Au NPs nanozyme

文献类型： 外文期刊

作者： Li, Qiulan 1 ; Li, Hong 1 ; Li, Kexiang 1 ; Gu, Yi 1 ; Wang, Yijie 1 ; Yang, Dezhi 1 ; Yang, Yaling 1 ; Gao, Lei 4 ;

作者机构： 1.Kunming Univ Sci & Technol, Fac Life Sci & Technol, Kunming 650500, Yunnan, Peoples R China

2.Kunming Univ Sci & Technol, Fac Met & Energy Engn, State Key Lab Complex Nonferrous Met Resources Cle, Kunming 650093, Yunnan, Peoples R China

3.Yunnan Acad Agr Sci, Inst Agroprod Proc, Kunming 650093, Yunnan, Peoples R China

4.Kunming Univ Sci & Technol, Fac Sci, Kunming 650500, Yunan, Peoples R China

关键词： Methylmercury; Nanozyme; Gold amalgamation; Peroxidase-like activity; Colorimetric

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：14.224； 五年影响因子：12.984 ）

ISSN： 0304-3894

年卷期： 2023 年 441 卷

页码：

收录情况： SCI

摘要： Methylmercury (MeHg+) is one of the common organic species of mercury, and has much higher toxicity than inorganic mercury. Based on the selective enhancement of the activity of nanozyme (NA-CDs/AuNPs) by MeHg+, a novel colorimetric nanoprobe for MeHg+ assay is proposed. The noradrenaline-based carbon dots (NA-CDs) as the reducing agent was applied to prepare the NA-CDs/AuNPs. The formation of gold amalgamation (Au@HgNPs) between nanozyme and MeHg+ allows to simultaneously accelerate the electron transfer from Au and Hg to NA-CDs and the generation of radicals (i.e. center dot OH, center dot O2- and center dot CH3). The NA-CDs/AuNPs has an outstanding anti-interference performance even in the presence of different mercury. Further density functionality theory (DFT) calculations revealed that the formation of Au@HgNPs via MeHg+ contributes to the significantly lowered activation energy, resulting in the peroxidase-like activity generation and acceleration. This leads to rapid (10 min) and specific colorimetric detection of MeHg(+ )with the detection limit of 0.06 mu g L-1. This introduces a novel method for simple and sensitive detection of MeHg+, giving a new horizon for the assay of organometallic compounds.

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