Samples of human serum gamma-globulin with specifically bound copper or zinc cations were studied in Mancini's radial immunodiffusion test with human antibodies to IgG (H+L). The intensity of antibody binding to zinc-modified protein was 10-20% higher in comparison with the reference sample, while detection of gamma-globulin with bound copper by antibodies was 20-30% lower than in the corresponding reference sample. Comparison with the results of native gamma-globulin testing indicates limitations of Mancini's method as the quantitative assay for practical diagnosis, because under certain clinical conditions the traditional method can give over- and underestimated results.
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