"Turn off-on" fluorescent sensor based on quantum dots and self-assembled porphyrin for rapid detection of ochratoxin A

文献类型： 外文期刊

第一作者： Liu, Li

作者： Liu, Li;Huang, Qingwen;Tanveer, Zafar Iqbal;Jiang, Keqiu;Zhang, Jinghui;Pan, Hongye;Luan, Lianjun;Liu, Xuesong;Wu, Yongjiang;Han, Zheng

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关键词： Quantum dots; Self-assembled zinc porphyrin; Turn off-on; Ochratoxin A

期刊名称：SENSORS AND ACTUATORS B-CHEMICAL （ 影响因子：7.46； 五年影响因子：6.743 ）

ISSN：

年卷期： 2020 年 302 卷

页码：

收录情况： SCI

摘要： We report herein a "turn off-on" fluorescent sensor based on ZnCdSe quantum dots (ZnCdSe QDs) and self-assembled zinc porphyrin for sensitive and rapid detection of ochratoxin A (OTA). Using environmentally friendly dodecyl dimethyl betaine as "soft template", zinc 5, 10, 15, 20-tetra(4-pyridyl)-21H-23H-porphine (ZnTPyP) was self-assembled into nanorods (SA-ZnTPyP) through a green process. The OTA detection process involves two steps: (1) the fluorescence of ZnCdSe QDs is significantly quenched by SA-ZnTPyP, and (2) the combination between SA-ZnTPyP and OTA releases ZnCdSe QDs from their quenchers such that the fluorescence is recovered. Under the optimized experimental conditions, the newly developed fluorescent sensor showed a linear response in concentration range 0.5-80 ng mL(-1), with a detection limit of 0.33 ng mL(-1). The excellent applicability of the system has been verified in milk and coffee samples, with relative recoveries between 98.33% and 103.70%. The proposed fluorescent sensor exhibits excellent selectivity and high sensitivity, and thus could be a promising tool for on-site determination of OTA in food safety control and environmental monitoring.

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