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Clinical Chemistry 31: 1335-1341, 1985;
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Clinical Chemistry, Vol 31, 1335-1341, Copyright © 1985 by American Association for Clinical Chemistry

Phenols as enhancers of the chemiluminescent horseradish peroxidase- luminol-hydrogen peroxide reaction: application in luminescence- monitored enzyme immunoassays

GH Thorpe, LJ Kricka, SB Moseley and TP Whitehead

Certain phenol derivatives, including p-iodophenol and p-phenylphenol, enhance light emission from the horseradish peroxidase-catalyzed oxidation of cyclic diacyl hydrazides such as luminol. The light emission decays slowly (glowing for several minutes) and its intensity may be greater than 1000-fold that of the unenhanced reaction. The enhanced system enables rapid, sensitive assay of peroxidase conjugates. We describe its application in immunoassays for human choriogonadotropin, digoxin, and factor VIII-related antigen. Luminescent quantification of peroxidase labels has been directly incorporated into immunoassays based on beads, tubes, or microtiter plates, used in conjunction with photodetectors such as photomultiplier tubes or instant photographic film. Enhancement with phenol derivatives exceeds that achieved with 6-hydroxybenzothiazole derivatives and depends on pH and enhancer concentration. Emission spectra of phenol- enhanced and unenhanced reactions are remarkably similar, suggesting that the enhancers do not act as more efficient emitters but exert their action earlier in the complex reaction between peroxidase, oxidant, and luminol.


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