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A fluorometric assay for cholesterol reductase activity.

J B Yang1, D C Beitz

  • 1Department of Animal Science, Iowa State University, Ames 50011.

Analytical Biochemistry
|November 1, 1992
PubMed
Summary
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A new fluorometric method accurately measures cholesterol reductase activity in pea leaves. This rapid, simple, and inexpensive technique offers a reliable alternative to traditional radiometric assays for biological specimens.

Area of Science:

  • Biochemistry
  • Plant Science

Background:

  • Cholesterol reductase plays a role in plant sterol metabolism.
  • Accurate assays are needed to study its activity in biological samples.

Purpose of the Study:

  • To develop and validate a novel fluorometric method for quantifying cholesterol reductase activity.
  • To compare the new method with existing radiometric techniques.

Main Methods:

  • A fluorometric assay utilizing the decrease in NADH fluorescence upon cholesterol reduction.
  • Incubation of pea leaf cytosol with micellar cholesterol and NADH.
  • Measurement of relative fluorescence at specific excitation and emission wavelengths.

Main Results:

  • The fluorometric method demonstrated a high correlation (R = 0.997) with the radiometric method.

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  • The assay is rapid, simple, and cost-effective.

    • Conclusions:

    • The developed fluorometric method is a suitable and accurate tool for determining cholesterol reductase activity.
    • This method can be applied to various biological specimens for efficient analysis.