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Clinical Chemistry 18: 675-676, 1972;
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Clinical Chemistry, Vol 18, 675-676, Copyright © 1972 by the American Association for Clinical Chemistry

Fluorometric Assay of Diphenylhydantoin in Plasma or Whole Blood

Wesley A. Dill 1 and Anthony J. Glazko 1

1 Department of Pharmacology, Research and Development Division, Parke, Davis & Co., Ann Arbor, Mich. 48106.

A highly sensitive assay procedure for 5,5-diphenylhydantoin (DPH) involves oxidation with alkaline permanganate to form benzophenone. This is then extracted with heptane, allowed to react with concentrated sulfuric acid, and the fluorescence of the reaction product is measured. The procedure appears to be fairly specific for DPH; 5-(p-hydroxyphenyl)-5-phenylhydantoin (a DPH metabolite), phenobarbital, or other anticonvulsant drugs do not interfere. The sensitivity of the fluorometric procedure permits assays on finger-blood specimens. It provides a simple means for evaluating the effectiveness of a given dose schedule in different subjects.

Submitted on April 7, 1972
Accepted on May 10, 1972







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Copyright © 1972 by the American Association for Clinical Chemistry.