A sensitive MnO2 nanosheet sensing platform based on a fluorescence aptamer sensor for the detection of zearalenone

文献类型： 外文期刊

第一作者： Qin, Guoxin

作者： Qin, Guoxin;Wei, Yuanwen;Zhou, Qifeng;Wang, Haijun;Wei, Yuning;Lao, Shuibing;Luo, Lihong;Mo, Renfu;Chen, Yongxian;Yang, Yuxia;He, Jie;Li, Huiling

作者机构：

期刊名称：ANALYTICAL METHODS （ 影响因子：3.532； 五年影响因子：3.244 ）

ISSN： 1759-9660

年卷期： 2022 年 14 卷 46 期

页码：

收录情况： SCI

摘要： An aptamer sensor based on manganese dioxide (MnO2) nanosheets was developed for the detection of zearalenone (ZEN). The ZEN aptamer was modified at the 5 '-end by a 6-carboxyfluorescein (6-FAM) fluorophore with self-assembly on MnO2 nanosheets. Interaction of the 6-FAM fluorophore at the 5 '-end of the ZEN aptamer with the MnO2 nanosheet lowered fluorescence (FL) intensity due to fluorescence resonance energy transfer (FRET). The introduction of ZEN into the sensing system resulted in hybridization with the ZEN aptamer, forming a stable G-quadruplex/ZEN, which exhibited a low affinity for the MnO2 nanosheet surface. The distance between the 6-FAM fluorophore and MnO2 nanosheet hampered FRET, with a consequent strong FL signal. Under the optimal experimental conditions, the FL intensity of the sensing system showed a good linear correlation with ZEN concentration in the range of 1.5-10.0 ng mL(-1), and a detection limit (S/N = 3) of 0.68 ng mL(-1). The sensing system delivered enhanced specificity for the detection of ZEN, and can find wide application in the detection of other toxins by replacing the sequence of the recognition aptamer.

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