A new spectrophotometric arginase assay

Raymond L. Ward, Paul A. Srere

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We wish to report a new method for the assay of arginase (l-arginine amidinohydrolase, EC Arginase, the terminal enzyme of the urea-ornithine cycle (1), catalyzes the cleavage of arginine to ornithine and urea. Present assays for arginase determine the released urea either by a colorimetric procedure (2) or by a manometric procedure with urease (3). Our new assay is a spectrophotometric method based on the fact that the absorbancy of arginase below 2100 Å is larger than the combined absorbancies of ornithine and urea. A cleavage of arginine catalyzed by the enzyme thus results in a net decrease in absorbancy at these wavelengths, allowing a rapid and accurate assay for arginase activity.

Original languageEnglish
Pages (from-to)102-106
Number of pages5
JournalAnalytical Biochemistry
Issue number1
Publication statusPublished - Jan 1967


ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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