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A specific quantitative colorimetric assay for L-asparagine

S Sheng1, J J Kraft, S M Schuster

  • 1Department of Biochemistry and Molecular Biology, College of Medicine, University of Florida, Gainesville 32610.

Analytical Biochemistry
|June 1, 1993
PubMed
Summary

A new colorimetric assay uses ninhydrin to specifically detect L-asparagine. This simple and inexpensive method offers a sensitive way to measure L-asparagine concentrations, even with interfering amino acids present.

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Area of Science:

  • Biochemistry
  • Analytical Chemistry

Background:

  • The reaction between amino acids and ninhydrin typically produces Ruhemann purple, with absorption maxima at 405 and 570 nm.
  • A distinct reaction between L-asparagine and ninhydrin at temperatures below 37°C yields a unique UV-visible absorption spectrum.

Purpose of the Study:

  • To develop a simple, specific, and sensitive colorimetric assay for L-asparagine detection.
  • To optimize reaction conditions for enhanced specificity and sensitivity of the L-asparagine-ninhydrin assay.

Main Methods:

  • Investigated the effects of reaction temperature, ninhydrin concentration, and pH on the L-asparagine-ninhydrin reaction.
  • Developed and validated a colorimetric assay using UV-visible spectrophotometry at 340 nm.
  • Compared results with High-Performance Liquid Chromatography (HPLC) amino acid analysis for enzyme activity measurements.

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Main Results:

  • The optimized assay showed a linear relationship between absorbance at 340 nm and L-asparagine concentration (50 µM to 50 mM).
  • The assay demonstrated high specificity, accurately measuring L-asparagine in the presence of other amino acids.
  • Comparable results were obtained when measuring L-asparagine synthetase and L-asparaginase activities using this method versus HPLC analysis.

Conclusions:

  • A novel, specific, sensitive, and cost-effective colorimetric assay for L-asparagine has been developed.
  • This assay is practical for quantifying L-asparagine in various biological and enzymatic systems.
  • The assay's simplicity and low cost make it valuable for widespread application in biochemical analysis.