title: Enzyme immunoassay for the determination of bovine growth hormone using avidin-biotin-peroxidase complexes.
abstract: The development of a competitive enzyme immunoassay for bovine growth hormone (bGH) is described. Antiserum, raised in rabbits and diluted 1/250,000, was preincubated with samples and free antibodies from the reaction mixture were immobilized using a microtiter plates coated with bGH. Bound antibodies remaining from the preincubation were visualized using a biotinylated second antibody as a bridge for subsequent amplification by an avidin-biotin-peroxidase complex. The measuring range was between 0.5 and 100 ng/ml. Cross-reactivity with other pituitary hormones was < 0.1%. The intra- and interassay coefficients of variations were 8.1 and 12.7%, respectively, and the recovery of added bGH was 110%. To validate the assay, two bull calves were treated with bGH-releasing factor. The response showed that there was an immediate rise in immunoreactive bGH which peaked after 5 and 15 min at 200 ng/ml and 60 ng/ml, respectively. This enzyme immunoassay is an economic and sensitive alternative to the established radioimmunoassay, and the first competitive enzyme immunoassay described for bGH.
authors.affiliation: Institute of Animal Husbandry and Genetics, Göttingen University, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Hennies
authors.forename: W
authors.initials: W
authors.lastname: Holtz
mesh_terms: D000818:Animals; D001360:Avidin; D001710:Biotin; D002417:Cattle / Q000097:blood*; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D013006:Growth Hormone / Q000097:blood* / Q000276:immunology; D008297:Male; D011817:Rabbits
chemical_list: D001360:Avidin; D001710:Biotin; D013006:Growth Hormone