数字农科院2.0

One-step homogeneous micro-orifice resistance immunoassay for detection of chlorpyrifos in orange samples

文献类型： 外文期刊

作者： Liangqiong Ren;Wanxian Feng;Feng Hong;Zhilong Wang;Hanying Huang;Yiping Chen

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关键词： Chlorpyrifos detection;Micro-orifice resistance immunoassay;One-step detection;Polystyrene microsphere probe

期刊名称： Food Chemistry

ISSN： 0308-8146

年卷期： 2022 年 386 卷

页码：

收录情况： SCIE（2022版） ; EI（2022版）

摘要： In this work, a one-step homogeneous micro-orifice resistance immunoassay has been proposed for chlorpyrifos detection by integrating functionalized polystyrene (PS) microsphere probes with particle counting technology. The particle counter is highly sensitive and accurate for detecting the state of PS microspheres, where the particles of different states exhibit significant differences in resistance. The state of the functionalized PS microspheres is altered from dispersed to aggregated during the antigen-antibody recognition. Based on the degree of aggregation of the functionalized PS microsphere probes, chlorpyrifos can be quantitatively detected through the competitive immune response between PS antibodies and PS complete antigens. This one-step homogeneous micro-orifice resistance immunoassay simplified the procedures and greatly increased the sensitivity of detection, which has been successfully applied to detect chlorpyrifos in orange samples within 0.5 h, with the detection limit of 0.058 ng/mL.

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