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Clinical Chemistry, Vol 20, 1556-1563, Copyright © 1974 by the American Association for Clinical Chemistry
1 Department of Pathology, Louisiana State University Medical
Center, 1542 Tulane Ave., New Orleans, La. 70112.
We have developed a new method for determination of serum ceruloplasmin from its oxidase activity, in which o-dianisidine dihydrochloride is used as substrate. o-Dianisidine dihydrochloride is more stable than is the more widely used p-phenylenediamine substrate, and forms a stable product that is measured at 540 nm. Correlation was good between results of this method and those obtained with both a p-phenylenediamine substrate method (r = 0.98) and a radial immunodiffusion procedure (r = 0.97). There is little or no interference from reducing or colored components of serum. The coefficient of variation (day-to-day) for the method was 4.2%. A normal range of 62-140 U/ liter has been determined by the reported method.
Submitted on June 13, 1974
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