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A spectrophotometric assay for dehydroascorbate reductase.

R L Stahl, L F Liebes, C M Farber

    Analytical Biochemistry
    |June 1, 1983
    PubMed
    Summary
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    A new spectrophotometric assay accurately measures dehydroascorbate reductase activity by monitoring ascorbic acid formation. This method offers a reliable and potentially advantageous alternative for enzyme quantification in biological samples.

    Area of Science:

    • Biochemistry
    • Enzymology
    • Spectrophotometry

    Background:

    • Dehydroascorbate reductase (DHAR) plays a crucial role in the ascorbate-regenerating system.
    • Accurate measurement of DHAR activity is essential for understanding its biological functions and for biochemical research.
    • Existing assays may have limitations in terms of simplicity, cost, or throughput.

    Purpose of the Study:

    • To describe a simple spectrophotometric assay for dehydroascorbate reductase (DHAR).
    • To validate the assay's performance using a partially purified enzyme preparation.
    • To compare the assay with a high-performance liquid chromatography (HPLC) method.

    Main Methods:

    • Spectrophotometric measurement of absorbance changes linked to ascorbic acid formation.

    Related Experiment Videos

  • Enzyme assays performed with partially purified DHAR from spinach leaves.
  • Correlation analysis with results obtained from a high-performance liquid chromatography (HPLC) method.

    • Main Results:

    • The spectrophotometric assay demonstrated linearity with both reaction time and enzyme concentration.
    • The assay accurately reflects DHAR activity, showing good correlation with the established HPLC method.
    • The method provides a straightforward approach for quantifying DHAR activity.

    Conclusions:

    • A simple and reliable spectrophotometric assay for dehydroascorbate reductase has been developed.
    • This assay offers potential advantages over existing methods for enzyme activity determination.
    • The assay is suitable for various applications in biochemical research and enzyme analysis.