期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 359, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2022.131528
关键词
Mycotoxins; Difunctional; Immunochromatographic assay; Magnetic-quantum dot; Multiplex detection
资金
- National Natural Science Founda-tion of China [81830101]
- Natural Science Foundation of Anhui Province [1908085QB85]
- National S&T Major Project for Infectious Diseases Control [2018ZX10712001-010, 2018ZX10101003-001]
A multiplexed immunochromatographic assay using magnetic-quantum dots as capture/detection immunoprobes was developed for simultaneous and sensitive detection of multiple mycotoxins in food samples. The method exhibited excellent accuracy, specificity, and stability, with low detection limits achieved in actual food samples.
There is a strong need for the development of a sensitive biosensor for real-time monitoring mycotoxins contamination in real food samples. Here, we reported a multiplexed immunochromatographic assay (ICA) using functionalized magnetic-quantum dot (QD) as capture/detection difunctional immunoprobes that can simultaneously and sensitively detect aflatoxin B1 (AFB1), ochratoxin A (OTA), and fumonisin B1 (FB1) in food. The antibodies-modified multilayer magnetic-QD nanobeads (MagQBD) allowed effective capture of three target mycotoxins from complex solution and simultaneously detect them on one ICA strip through fluorescence signal reading. The detection sensitivity of MagQBD-ICA was markedly improved due to the signal amplification of the multilayer QD shell and target enrichment. With capture/detection strategy, multiplexed detection of AFB1, OTA, and FB1 was conducted, resulting in low detection limits of 0.42, 11.48, and 4.21 pg mL(-1), respectively. The excellent accuracy, specificity, and stability of the method were further confirmed by testing actual samples including rice, peanut, corn and juices. Results suggested the great potential of MagQBD-ICA for practical detection of mycotoxins-contaminated food.
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