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An automated colorimetric procedure is described for the determination of serum and urine uric acid with improved specificity. Hydrogen peroxide, formed when uric acid is oxidized by uricase, oxidatively couples with 3-methyl-2-benzothiazolinone hydrazone and N,N-dimethylaniline, in the presence of peroxidase, to produce a stable, sensitive indamine dye. The method is reproducible, and the results correlate well with those obtained by a manual spectrophotometric uricase procedure. Also, the automated procedure is resistant to many added reducing substances that cause positive interferences in alkaline phosphotungstate methods.
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Gochman et al. (1971) studied this question.
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