Abstract
2-amino-3-methylimidazo [4, 5-f] quinoline (IQ), is a type of heterocyclic aromatic amines (HAAs) formed during the thermal treatment of food processing, which possesses potential carcinogenicity and mutagenicity for humans. In this work, a simple, selective and sensitive direct competitive enzyme-linked immunosorbent assay (dcELISA) for detecting IQ has been developed for the first time. 1H-pyrrolo [2, 3-f] quinoline (PQ), a structural analogue of IQ, was connected with two-carbon arm to obtain the hapten PQ acid (PQA), and then a specific polyclonal antibody was produced with PQA-bovine serum albumin (BSA) as immunogen. The half-maximum inhibition concentration (IC50) and limit of detection (LOD; calculated as IC15 value) of the assay were 50 ± 3 and 3 ± 0.3 μg L−1, respectively. The assay showed no cross-reactivity with other HAAs analogues except 2-amino-3,4-dimethylimidazo [4,5-f] quinoline (MeIQ) (12 %), which indicated that the assay had high specificity for the IQ. The proposed method was further applied successfully to determine IQ in fried beef, fried pork, and dried fish floss samples with satisfactory recoveries (84.96–116.23 %) and precision (CV%, 4.96–17.26 %). The LOD for IQ in processed foods was 15 μg kg−1. In addition, the results of the established method were in good agreement with the high-performance liquid chromatography (HPLC) (R 2 = 0.9917). All above shows the proposed immunoassay allows for a cost-effective, specific, accurate, and reliable quantitative detection of IQ in real processed food samples.
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The authors are grateful for financial supports from the Ministry of Science and Technology of the People’s Republic of China (Project no. 2011AA100806), the National Natural Science Foundation of China (Project no. 31201353), Tianjin Municipal Science and Technology Commission (Project no. 13JCQNJC15300), and International Science and Technology Cooperation Program of China (Project no. 2014DFR30350).
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Wei Sheng declares that she has no conflict of interest. Xuqin Ran declares that she has no conflict of interest. Gaoshuang Hu declares that she has no conflict of interest. Yan Zhang declares that she has no conflict of interest. Yang Lu declares that she has no conflict of interest. Bing Liu declares that she has no conflict of interest. Shuo Wang declares that he has no conflict of interest.
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Sheng, W., Ran, X., Hu, G. et al. Development of an Enzyme-Linked Immunosorbent Assay for the Detection of 2-Amino-3-Methylimidazo [4, 5-f] Quinoline (IQ) in Processed Foods. Food Anal. Methods 9, 1036–1045 (2016). https://doi.org/10.1007/s12161-015-0282-8
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DOI: https://doi.org/10.1007/s12161-015-0282-8