Abstract
In order to address the widespread concerns with food safety such as adulteration and forgery in the edible oil field, this study developed a fluorescence polarization immunoassay (FPIA) based on a monoclonal antibody in a homogeneous solution system for determination of capsaicinoids in gutter cooking oil by using chemically stable capsaicinoids as an adulteration marker. The prepared fluoresceinthiocarbamyl ethylenediamine (EDF) was coupled with capsaicinoid hapten C, and the synthesized tracer was purified by thin-layer chromatography (TLC) and showed good binding to the monoclonal antibody CPC Ab-D8. The effects of concentration of tracer and recognition components, type and pH of buffer and incubation time on the performance of FPIA were studied. The linear range (IC20 to IC80) was 3.97–97.99 ng/mL, and the half maximal inhibitory concentration (IC50) was 19.73 ng/mL, and the limit of detection (LOD) was 1.56 ng/mL. The recovery rates of corn germ oil, soybean oil and peanut blend oil were in the range of 94.7–132.3%. The experimental results showed that the fluorescence polarization detection system could realize the rapid detection of capsaicinoids, and had the potential to realize on-site identification of gutter cooking oil. As a universal monoclonal antibody, CPC Ab-D8 can also specifically identify capsaicin and dihydrocapsaicin, so the proposed method can be used to quickly monitor for the presence of gutter cooking oil in normal cooking oil.
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This research was supported by grants from the National Natural Science Foundation of China (No. 32161133008, No. 31701681).
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Capsaicinoid monoclonal antibody (CPC Ab-D8, 0.5 μg/mL) and capsaicinoid antigen (4-[(4-hydroxy-3-methoxybenzyl) amino]-4-oxobutanoic acid-BSA (bovine serum albumin) conjugates, BSA-hapten C, 5 mg/mL) were obtained from Oil Crops Research Institute, Chinese Academy of Agricultural Sciences (Wuhan, China).
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Zhang, J., Zhang, M., Yang, Q. et al. A simple and rapid homogeneous fluorescence polarization immunoassay for rapid identification of gutter cooking oil by detecting capsaicinoids. Anal Bioanal Chem 414, 6127–6137 (2022). https://doi.org/10.1007/s00216-022-04177-2
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DOI: https://doi.org/10.1007/s00216-022-04177-2