Abstract
In this study, trichlorfon and chlorpyrifos conjugated to CdSe/ZnS quantum dots with different emission wavelengths were adopted as labels. A hydrophilic imprinted film synthesized directly on the surface of a 96-well plate was used as the antibody. A direct competitive biomimetic immunoassay method for simultaneous determination of trichlorfon and chlorpyrifos in fruits and vegetables was developed. Under optimal conditions, the limit of detection of this method was 18.0 μg/L for chlorpyrifos (55 mg/kg for sample) and 19.0 μg/L for trichlorfon (45 mg/kg for sample). Orange and carrot samples spiked with chlorpyrifos and trichlorfon were extracted and determined by this method with recoveries ranging from 77.8 to 92.0%. The method was applied for detection of chlorpyrifos and trichlorfon residues in banana and apple samples, and the results correlated well with those obtained using gas chromatography.
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Funding
This work is financially supported by the National Natural Science Foundation of China (Project No. 31471649).
Dr. Zhixiang Xu has received research grants from the National Natural Science Foundation of China.
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Qiurui Liu, Jixin Tian, Mingdi Jiang, Xuguang Qiao, and Zhixiang Xu declare that they have no conflict of interest.
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This article does not contain any studies with animals performed by any of the authors.
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Informed consent was obtained from all individual participants included in the study.
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Liu, Q., Tian, J., Jiang, M. et al. Direct Competitive Biomimetic Immunoassay Based on Quantum Dot Label for Simultaneous Determination of Two Pesticide Residues in Fruit and Vegetable Samples. Food Anal. Methods 11, 3015–3022 (2018). https://doi.org/10.1007/s12161-018-1285-z
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DOI: https://doi.org/10.1007/s12161-018-1285-z