Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 61, Issue 20, Pages 4765-4770Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf400056p
Keywords
mimotope; phage display; fumonisin B-1; peptide; ELISA
Funding
- National Natural Science Foundation of China [NSFC-31201360, NSFC-31171696]
- National Key Technology R & D Program of the 12th Five-Year Plan [2012BAK17B02]
- State Key Laboratory of Food Science and Technology of Nanchang University [SKLF-TS-200815, SKLF-TS-201110]
- cooperation project in industry, education, and research of Guangdong province [2010B090400182]
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Anti-fumonisin B-1 (FB1) McAb 1D11 was used as the target for biopanning from a phage random loop-constrained heptapeptide library. After three cycles of panning, seven phages with three mimotope peptides were selected to mimic the binding of FB1 to 1D11. After the identification of phage ELISA, the phage clone that showed the best linear range of detection was chosen for further research. One peptide with the inserted peptide sequence of the phage was synthetized, named CT-452. An indirect competitive ELISA (peptide ELISA) for detecting FB1 was established using the CT-452-bovine serum albumin conjugate as coating antigen. The linear range of the inhibition curve was 1.77-20.73 ng/mL. The half inhibitory concentration (IC50) was 6.06 ng/mL, and the limit of detection was 1.18 ng/mL. This method was compared with conventional indirect ELISA (commercial ELISA kit) and high-performance liquid chromatography (HPLC), and the results showed the reliability of the peptide ELISA for the determination of FB1 in cereal samples. The relationship between the CT-452 and FB1 standard concentrations in peptide ELISA was evaluated. The results indicated that synthetic peptide CT-452 can replace the FB1 standard to establish an immunoassay free of FB1.
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