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Development of novel IC-ELISA as a primary high throughput screening for various estrogen molecules

Abstract

An indirect competitive enzyme-linked immunosorbent assay (IC-ELISA) has been developed for detecting estrogen molecules in environmental samples. For generating anti-estrogen monoclonal antibody (mAb), BALB/c mice were immunized with 17-estra-diol (E2)-BSA and 5760 hybridoma cell lines were established. Through the optimization processes, a mAb(4BSA-e 3C11) and estriol(E3)-BSA were finally selected as a primary antibody and a coating antigen, respectively. The IC50 value for a standard estrogen (17β-E2) was 6.26 ng mL and the detection range (20–80% B/B0) was 0.01–377.92ng mL. The developed IC-ELISA showed some cross-reactivities (CRs) to various estrogen analogues, such as estrone (E1) (1.79%), E3(77.34%), 16-epiestriol(27.54%) and 16 keto-17β-E2(2.02%). On the other hand, the assay showed a negligible CRs to other steroid hormones (CR5<0.063%), suggesting the specificity of the assay to estrogen molecules. For assay validation, the developed IC-ELISA was compared side by side with high performance liquid chromatography (HPLC), which showed no significant difference in their performances between the two methods. The sensitivity of our IC-ELISA was approximately 100 fold higher than that of HPLC. The estrogen contents (Estrogen Equivalent Concentrations; EEC) in field samples were determined using the IC-ELISA, including swine sewage effluents (7.043 ± 0.023 ng-EEC mL−1), bovine feces (0.013±0.001 ng-EEC mL−1), and avian feces (0.017±0.001 ng-EEC mL). Conclusively, we have developed an IC-ELISA that is highly sensitive to estrogens as well as can detect various estrogen analogues at the same time. This assay can be used as a primary screening for a large number of field samples before the instrumental analysis that is laborintensive and time-consuming.

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Correspondence to Euikyung Kim.

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Cha, M., Sohn, E., Jung, E. et al. Development of novel IC-ELISA as a primary high throughput screening for various estrogen molecules. Toxicol. Environ. Health. Sci. 2, 50–59 (2010). https://doi.org/10.1007/BF03216513

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Keywords

  • Estrogens
  • Enzyme-linked immunosorbent assay
  • High throughput screening