LU Yi-na,SU You-zhi,CHENG Tie-yuan,XU Juan,YI Xiong-hai,LIU Jun,LI Zhi-xiong,LI Guan-si.Detection of Bongkrekic Acid in Food by Flow Cytometry Fluorescence Immunoassay[J].Journal of Instrumental Analysis,2025,44(04):667-674.
LU Yi-na,SU You-zhi,CHENG Tie-yuan,XU Juan,YI Xiong-hai,LIU Jun,LI Zhi-xiong,LI Guan-si.Detection of Bongkrekic Acid in Food by Flow Cytometry Fluorescence Immunoassay[J].Journal of Instrumental Analysis,2025,44(04):667-674. DOI: 10.12452/j.fxcsxb.241025484.
Detection of Bongkrekic Acid in Food by Flow Cytometry Fluorescence Immunoassay
In this study,a quantitative detection assay for bongkrekic acid (BA) based on flow cytometry fluorescence immunoassay was established. Synthesize BA-BSA complete antigen and obtain high titer monoclonal anti-BA antibody by immunization. BA-BSA labeled with phycoerythrin competes with BA in the sample for a limited number of antibody binding sites on the fluorescent microspheres. The average f
luorescence intensity on the surface of the microspheres is detected by flow cytometry to achieve accurate quantitative determination of BA in the sample. The results showed that the assay achieved greatlinearity in the linear ranges from 1.01 μg/L to 97.96 μg/L,and the correlation coefficient(
r
2
) was 0.999 8. The limit of detection(LOD)was 0.56 μg/kg. The recoveries in samples ranged from 90.4% to 104%,while the relative standard deviation was between 5.0% and 9.8%. The cross reactivities with ochratoxin A,aflatoxin B1,aflatoxin M1,fumonisin B1,and fumonisin B2 were all less than 0.1%. One positive sample was detected in 18 food samples,with a BA concentration of 6.5 µg/kg,which was consistent with the results obtained by high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) instrument. The flow cytometry fluorescence immunoassay method established in this study is simple,rapid,sensitive,and accurate,and can be extended to the analysis and detection of other fungal toxins in complex matrices such as various foods.
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