Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 390, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2023.133909
Keywords
Zearalenone; Photothermal; Lateral flow immunoassay; Black phosphorus -Au nanocomposite; Cereals
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In this study, a novel photothermal lateral flow immunoassay (LFIA) based on gold nanoparticle loaded black phosphorus (BP-Au) nanocomposite was developed for rapid detection of zearalenone (ZEN). The method exhibited a low detection limit and a wide linear range, allowing for monitoring of trace ZEN content and rapid and accurate assessment of exceeding limits.
Mycotoxin zearalenone can induce reproductive toxicity and oxidative toxicity, so its on-site monitoring in foods is of great significance in food control. Herein, we develop a novel photothermal lateral flow immunoassay (LFIA) for ZEN based on gold nanoparticle loaded black phosphorus (BP-Au) nanocomposite. The self-assembled BP-Au nanocomposite showed a dark purple color and an excellent photothermal conversion efficiency of 69.62%, better than either BP or Au. Therefore, it was developed into not only a colorimetric probe for qualification but also a sensitive photothermal probe for quantification. Our competitive LFIA showed a detection limit down to 17.2 ng/kg and an ultrawide linear range of 10 pg/mL-106 pg/mL in its photothermal mode. The recoveries of ZEN in cereals were between 91.8% and 120.2%. The wide detection range of our method allows monitoring the variation of trace ZEN content to evaluate food storage and transportation conditions, but also gives regulators a fast and accurate picture of the level of ZEN exceeding limits without relying on laboratory chromatography.
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