Development of a sensitive heterologous ELISA method for analysis of acetylgestagen residues in animal fat |
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Authors: | Chi-Fang Peng Yong-Wei Chen Wei Chen Chuan-Lai Xu Jin-Moon Kim Zheng-Yu Jin |
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Affiliation: | 1. School of Food Science and Technology, Southern Yangtze University, Wuxi 214122, China;2. Jiangsu Institute of Nuclear Medicine, Wuxi 214063, China |
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Abstract: | A new heterologous ELISA method for detecting acetylgestagen multi-residues in animal fat was developed. An antibody generated has high cross-reactivity with relative progestogens (up to 50%) and no cross-reactivity with other steroids (<0.1%) in homologous ELISA. Three heterologous immunoassay were developed and one of them improved not only sensitivity but also the class-selectivity compared with the homologous assay against these progestogens. The IC50 for four acetylgestagens, chlormadinone acetate (CMA), 17α-hydroxyprogesterone acetate (HPA), megestrol acetate (MEGA) and medroxyprogesterone acetate (MPA) were, 4.5, 2.5, 2.9 and 1.8 μg/L, respectively. The cross-reactivity for CMA, HPA and MEGA were 40%, 72% and 62% when they were compared with MPA. Progestogens recoveries from spiked swine fat averaged between 61% and 78%. Results obtained from LC/MS/MS method showed the heterologous ELISA method developed was reliable and suitable for rapid screening the four progestogens residues in fat tissues. |
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Keywords: | Acetylgestagen Multi-residues Heterologous ELISA Fat |
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