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A comparative study of horseradish peroxidase conjugates prepared with a one-step and a two-step method

DM Boorsma and GL Kalsbeek

In this study we compared horseradish peroxidase (HRP)-labeled rabbit antihuman immunoglobulin G (IgG) conjugates, prepared by a one-step and a two-step method. Glutaraldehyde was used as a cross-linking agent. Two methods were used for removing unconjugated HRP: Sephadex G-200 gel chromatography and ammonium sulfate precipitation. The conjugates were characterized immunologically, immunochemically and enzymatically. The immunohistoenzymic properties of the conjugates were tested on unfixed cryostat sections of the skin of patients with chronic discoid lupus erythematosus. The influence of the presence of unconjugated HRP and unconjugated IgG was studied. Optimal results were obtained with conjugates prepared by a two-step method. Removing unconjugated HRPimproved the immunohistoenzymic properties of the conjugates. Conjugated and unconjugated IgG could be separated by Sephadex G-200 gel chromatography.

Volume 23, Issue 3, pp. 200-207, 03/01/1975
Copyright © 1975 by The Histochemical Society


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The Journal of Histochemistry & Cytochemistry is owned, published, and licensed by The Histochemical Society © 1975