title: Production of antisera to synthetic benzyloxycarbonyl-C-peptide of human proinsulin.
abstract: Antisera to the C-peptide of human proinsulin were obtained by immunizing guinea pigs with synthetic benzyloxycarbonyl-C-peptide conjugated to human albumin with 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide. In three series of 10, the animals were injected with C-peptide conjugated to albumin in the molar ratio of 23 : 1, 15 : 1, and 4 : 1, respectively. Antibodies to human C-peptide were present in all the surviving 25 animals. Fifteen of the antisera were suitable for measuring C-peptide concentrations lower than 0.10 pmol/ml. The antisera demonstrated an increasing immunogenicity with increasing molar ratio of C-peptide to albumin in the conjugate. In the fourth series, ten guinea pigs immunized with benzyloxycarbonyl-C-peptide ionically bound to QAE-Sephadex A-25 did not produce detectable antibodies to C-peptide. A qualitative evaluation of the radioimmunoassay by use of the antiserum with the highest titer and sensitivity, "M 1230", revealed a mean intra-assay and inter-assay coefficient of variance of 3.2 and 9.6%, respectively.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D000918:Antibody Specificity; D000936:Antigen-Antibody Complex; D002850:Chromatography, Gel; D006168:Guinea Pigs / Q000276:immunology; D006801:Humans; D007106:Immune Sera; D010446:Peptide Fragments / Q000276:immunology*; D011384:Proinsulin / Q000276:immunology*; D011863:Radioimmunoassay
chemical_list: D000936:Antigen-Antibody Complex; D007106:Immune Sera; D010446:Peptide Fragments; D011384:Proinsulin