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Development and optimization of an indirect enzyme-linked immunosorbent assay for the determination of Hexoestrol

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An indirect enzyme-linked immunosorbent assay (ELISA) for the detection of hexoestrol (HES) was developed, optimized and validated for the analysis of HES in pork. Many parameters, such as the volume ratio of solution A and solution B, colour developing time, pH value, incubation time, the volume ratio of the standard solution and diluted antiserum, blocking solution, blocking condition, coating solution and coating condition were studied and optimized in the paper. The regression equation of the final inhibition curve is y = – 0.3345x + 1.4955, R2=0.9913. The linear range is 0.1–8.1 ng/ml, and the IC50 is 0.671 ng/ml. The specificity of the assay was evaluated by the cross-reactivity rates of six compounds, of which two structurally related compounds had a relatively higher cross-reactivity rate of 25% and 6%. HES was added into a pork sample at 5 ng/g level and then the sample was extracted. The recovery is between 49.6% and 79.2%, and the variation coefficient is 0.164.

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Keywords: ELISA; Hexoestrol; optimization

Document Type: Research Article

Affiliations: School of Food Science and Technology, Southern Yangtze University, Wuxi, Jiangsu Province, PR China

Publication date: September 1, 2006

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