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Hapten design and indirect competitive immunoassay for parathion determination: Correlation with molecular modeling and principal component analysis by Yi Hua Liu; Mao Jun Jin; Wen Jun Gui; Jing Li Cheng; Yi Rong Guo; Guo Nian Zhu is a Chemistry article available to read on EtoBox.

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A novel procedure for parathion hapten design is described. The optimal antigen for parathion was selected after molecular modeling studies of six types of potentially immunizing haptens with the aim to identify the best mimicking target analyte. Heterologous competitive indirect enzymelinked immunosorbent assay (ELISA) was developed after screening a battery of competitors as coating antigens. The relationship between the heterology degree of the competitor and the resulting immunoassay detectability was investigated according to the electronic similarities of the competitor haptens and the target analyte. Molecular modeling and principal component analysis were performed to understand the electronic distribution and steric parameters of the haptens at their minimum energetic levels. The results suggested that the competitors should have a high heterology to produce assays with good detectability values. An indirect competitive ELISA was finally selected for further investigation. The immunoassay had an IC 50 value of 4.79 ng mL -1 and a limit of detection of 0.31 ng mL -1 . There was little or no cross-reactivity to similar compounds tested except for the insecticide parathion-me

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Author

Yi Hua Liu; Mao Jun Jin; Wen Jun Gui; Jing Li Cheng; Yi Rong Guo; Guo Nian Zhu

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0003-2670)

Published

2007

Language

EN

Field

Chemistry (Physical Sciences)