A Novel Graphene Oxide-Based Aptasensor for Amplified Fluorescent Detection of Aflatoxin M-1 in Milk Powder

文献类型： 外文期刊

第一作者： Guo, Xiaodong

作者： Guo, Xiaodong;Wen, Fang;Qiao, Qinqin;Zheng, Nan;Wang, Jiaqi;Guo, Xiaodong;Saive, Matthew;Fauconnier, Marie-Laure;Guo, Xiaodong;Wen, Fang;Qiao, Qinqin;Zheng, Nan;Wang, Jiaqi;Zheng, Nan;Wang, Jiaqi

作者机构：

关键词： aflatoxin M-1; aptamer; graphene oxide; DNase I; food safety

期刊名称：SENSORS （ 影响因子：3.576； 五年影响因子：3.735 ）

ISSN：

年卷期： 2019 年 19 卷 18 期

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收录情况： SCI

摘要： In this paper, a rapid and sensitive fluorescent aptasensor for the detection of aflatoxin M-1 (AFM(1)) in milk powder was developed. Graphene oxide (GO) was employed to quench the fluorescence of a carboxyfluorescein-labelled aptamer and protect the aptamer from nuclease cleavage. Upon the addition of AFM(1), the formation of an AFM(1)/aptamer complex resulted in the aptamer detaching from the surface of GO, followed by the aptamer cleavage by DNase I and the release of the target AFM(1) for a new cycle, which led to great signal amplification and high sensitivity. Under optimized conditions, the GO-based detection of the aptasensor exhibited a linear response to AFM(1) levels in a dynamic range from 0.2 to 10 mu g/kg, with a limit of detection (LOD) of 0.05 mu g/kg. Moreover, the developed aptasensor showed a high specificity towards AFM(1) without interference from other mycotoxins. In addition, the technique was successfully applied for the detection of AFM(1) in infant milk powder samples. The aptasensor proposed here offers a promising technology for food safety monitoring and can be extended to various targets.

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