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  • Title: Highly sensitive second antibody format enzymeimmunoassay for determination of 13,14-dihydro-15-keto-PGF2alpha in blood plasma of mithun (Bos frontalis).
    Author: Mondal M, Meyer HH, Rajkhowa C, Prakash BS.
    Journal: Prostaglandins Other Lipid Mediat; 2006 Jul; 80(1-2):100-9. PubMed ID: 16846791.
    Abstract:
    As an alternative to radioimmunoassays, a simple, highly sensitive and quick enzymeimmunoassay (EIA) for determination of 13,14-dihydro-15-keto-PGF(2alpha) (PGFM) in blood plasma of mithun (Bos frontalis; bovine) on microtitreplates using second antibody coating technique and PGFM-horseradish peroxidase as a label has been developed. The wells of the microtitreplate were coated with affinity-purified goat IgG (antirabbit IgG) that binds the hormone specific antibody. The EIA was carried out directly in 20microl plasma. The PGFM standard curve, with doses ranging from 0.1 to 50pg/well was linear. The sensitivity of the assay was 5pg/ml. PGFM standard curve in buffer showed parallelism with serially diluted mithun plasma containing high endogenous PGFM. Plasma PGFM concentrations estimated by using the developed EIA and commercially available PGFM EIA kit in the same samples were significantly correlated (r=0.98) and showed linearity. Intra- and inter-assay coefficients of variation were below 7%. Recovery of known concentrations of added PGFM in charcoal stripped plasma was linear (r=0.99). The developed EIA was further validated biologically by estimating PGFM in cyclic cows for the entire estrous cycle and in peri-parturient cows beginning day 7 prior to calving till day 30 post-calving; the concentrations were along with the expected lines as reported in bovine. In conclusion, the EIA developed in this study is simple, highly sensitive, valid and sufficiently reliable method for estimation of PGFM directly in bovine plasma.
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