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We describe a direct colorimetric method for the enzymatic assay of uric acid. 50 microliters serum aliquots are incubated for 30 min with a diluted hexacyanoferrate solution, to remove interference by non-specific reducing agents. Uric acid is then oxidized to allantoin in the presence of uricase (Aspergillus flavus), with the simultaneous production of hydrogen peroxide; this is measured by a modified Emerson-Trinder reaction, in which phenol has been replaced by sulphonated 2,4-dichlorophenol, a more sensitive chromogen. The method gives linear results up to 20 mg of uric acid/100 ml.
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