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  • Title: Sandwich enzyme immunoassay of human chorionic gonadotropin using polystyrene beads as solid support.
    Author: Gupta SK, Guesdon JL, Avrameas S, Talwar GP.
    Journal: Ann Inst Pasteur Immunol (1985); 1985; 136D(1):47-55. PubMed ID: 3904594.
    Abstract:
    A solid-phase sandwich enzyme immunoassay for human chorionic gonadotropin (hCG) employing monoclonal antibodies directed against beta- and alpha-subunits is described. Polystyrene beads used as solid support were coated with monoclonal anti-beta-hCG antibody. Monoclonal anti-alpha-hCG antibody was labelled with the enzyme, horseradish peroxidase. The assay could be performed by a "one-step" or "two-step" procedure. The sensitivity of the two-step procedure was 7.8 ng hCG/ml with a linear range up to 500 ng hCG/ml. The one-step procedure had a measurement range between 15.6 and 125 ng hCG/ml. Within the limits of measuring ranges, the two procedures had similar accuracy, the correlation coefficient being 0.987. Twenty-one urine samples from pregnant women were analysed by the two-step procedure and also by radioimmunoassay. The results were comparable, with r = 0.956.
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