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  • Title: A novel enzyme immunoassay of anti-insulin IgG in guinea pig serum.
    Author: Kohno T, Ishikawa E.
    Journal: Biochem Biophys Res Commun; 1987 Sep 15; 147(2):644-9. PubMed ID: 3115264.
    Abstract:
    A novel enzyme immunoassay of anti-insulin IgG in guinea pig serum is described. Guinea pig anti-insulin serum diluted with nonspecific guinea pig serum was incubated with dinitrophenyl biotinyl nonspecific rabbit IgG-insulin conjugate and a rabbit (anti-dinitrophenyl bovine serum albumin) IgG-coated polystyrene ball. After washing to eliminate nonspecific guinea pig IgG in the diluted serum, the polystyrene ball was incubated with dinitrophenyl-L-lysine to elute the complex of anti-insulin IgG and the conjugate. The eluate was incubated with an avidin-coated polystyrene ball. Finally, the amount of guinea pig anti-insulin IgG in the complex trapped onto the avidin-coated polystyrene ball was measured by incubation with rabbit (anti-guinea pig IgG) Fab'-peroxidase conjugate. This enzyme immunoassay was 10,000-fold more sensitive than the conventional enzyme immunoassay using insulin-coated polystyrene ball and rabbit (anti-guinea pig IgG) Fab'-peroxidase conjugate.
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