Portable and quantitative detection of carbendazim based on the readout of a thermometer.

Ruijie Fu, Jing Zhou, Yanlin Liu, Yiwen Wang, Haoran Liu, Junxiao Pang, Yongliang Cui, Qiyang Zhao, Chengqiu Wang, Zhixia Li, Bining Jiao, Yue He

Food chemistry 2021 Jul 30

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The detection of carbendazim (CBZ) is important for food safety and human health. However, most current analytical methods require large instruments and highly trained operators. In order to solve this problem, herein, an innovative portable and quantitative photothermal assay platform relying on a thermometer readout for the detection of CBZ has been developed. Gold nanoparticles (AuNPs), which exhibit a strong distance-dependent photothermal effect under specific laser irradiation, were utilized as indicators. The CBZ aptamer was introduced to protect AuNPs from salt-mediated aggregation. When CBZ is present, the binding event between CBZ and aptamer leads to the loss of the aptamer protective effect on AuNPs, and AuNP aggregation occurs. Under 650-nm laser irradiation, the increase in temperature associated with an AuNP-dependent photothermal effect is highly related to the CBZ concentration. Having the advantages of user-friendliness, low cost, quick response, and portability, this method has great potential for on-site applications. Copyright © 2021 Elsevier Ltd. All rights reserved.

Citation

Ruijie Fu, Jing Zhou, Yanlin Liu, Yiwen Wang, Haoran Liu, Junxiao Pang, Yongliang Cui, Qiyang Zhao, Chengqiu Wang, Zhixia Li, Bining Jiao, Yue He. Portable and quantitative detection of carbendazim based on the readout of a thermometer. Food chemistry. 2021 Jul 30;351:129292