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Highly sensitive fluorescent turn-on lateral flow strip for chlorothalonil based on an indicator displacement ratiometric fluorescent assay

文献类型： 外文期刊

作者： Ren, Hongxin 1 ; Li, Guowen 1 ; Yue, Xin 1 ; Chen, Xiujin 3 ; Zhang, Cunzheng 1 ; Wang, Zhouping 1 ; Peng, Chifang 1 ;

作者机构： 1.Jiangnan Univ, State Key Lab Food Sci & Technol, Lihu Rd 1800, Wuxi 214122, Peoples R China

2.Jiangnan Univ, Sch Food Sci & Technol, Lihu Rd 1800, Wuxi 214122, Peoples R China

3.Henan Univ Sci & Technol, Coll Food & Bioengn, Luoyang 471000, Peoples R China

4.Jiangsu Acad Agr Sci, State Key Lab Food Qual & Safety, Nanjing 210014, Peoples R China

5.Jiangnan Univ, Int Joint Lab Food Safety, Lihu Rd 1800, Wuxi 214122, Peoples R China

关键词： Indicator displacement assays; Chlorothalonil sensing; Dual signal responses; Ratio fluorometric; Lateral flow assay

期刊名称：SENSORS AND ACTUATORS B-CHEMICAL （ 影响因子：8.4； 五年影响因子：7.2 ）

ISSN：

年卷期： 2023 年 381 卷

页码：

收录情况： SCI

摘要： Nanomaterial based indicator displacement assays (IDA) have demonstrated interesting applications in chemosensing, however, restricted to fluorescence quenching nanomaterials. Fluorescent metal nanocluster (NCs) serving as a receptor in IDA may provide new sensing applications. In this work, we utilized GSH/CD-AuNCs as receptor and kaempferol/Al3+ complex (KAE/Al3+) as indicator to fabricate a new nanomaterial based IDA. Due to inner filter effect (IFE) and photoinduced electron transfer (PET) effect, the fluorescence of GSH/CD-AuNCs was greatly quenched by KAE/Al3+ complex. In the presence of chlorothalonil (CHL), CHL was more likely to enter the cavity than KAE/Al3+ due to its higher affinity with beta-CD, thereby restoring the AuNCs fluorescence. Meanwhile, the fluorescence of KAE/Al3+ could be greatly enhanced after beta-CD inclusion. Based on the above principle, an indicator displacement ratiometric fluorescent assay (IDRFA) for CHL was successfully constructed. Moreover, we integrated this IDRFA with lateral folw assay (LFA) format to develop a novel fluorescent turn-on IDA-LFA for CHL, which facilitated the naked eye discrimination and sensitive quantitative detection through LFA. Due to the advantages of rapid (completed within 1 min), and highly sensitive (even higher than some immunochromatographic strips), this novel IDA-LFA strip have high potential in rapid screening CHL.

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