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Quantification of antiserum reactivity in immunocytochemistry. Two new methods for measuring peroxidase activity on antigen-coupled beads incubated according to an immunocytoperoxidase method

CW Pool, S Madlener, PC Diegenbach, AA Sluiter and P van der Sluis

Antigens covalently coupled to agarose beads provide a matrix for an economical, sensitive, and quantitative immunocytochemical detection of antiserum bindings potencies. Despite some very powerful features (e.g., the ability to control the outcome of a solid phase adsorption on the same matrix), the use of this technique is not very widespread when compared with the other enzyme-linked immunosorbent assay (ELISA) techniques. The main reason for this is the necessity for rather laborious measurements of the immunocytochemical tracer on individual beads. A description of two new methods for the batch measurement of the peroxidase activity on immunoperoxidase incubated antigen-coupled beads is presented. The first method involves the measurement of the diaminobenzidine (DAB) extinction from a large number of beads with a scanning microspectrophotometer. In the second method, during the peroxidase reaction, the beads are incubated with o-phenyldiamine (OPD), which is soluble both in the reduced and oxidized form, whereby absorbance measurements of the supernatant of the beads in a normal spectrophotometer are possible. The sensitivity and the quantitative relation between bound first antibody and absorbance are compared for both methods. From the two immunoperoxidase procedures used (the three step peroxidase-antiperoxidase and the two-step peroxidase conjugate procedure) only the latter met the conditions for a quantitative (first) antibody assay.

Volume 32, Issue 9, pp. 921-928, 09/01/1984
Copyright © 1984 by The Histochemical Society


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