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Related Experiment Videos

Enzymatic microanalysis of glycogen.

B P Brodal, B B Gehrken

    Scandinavian Journal of Clinical and Laboratory Investigation
    |April 1, 1986
    PubMed
    Summary

    A new enzymatic method accurately measures tissue glycogen using readily available enzymes and fluorometric detection. This simple assay offers a low detection limit for quantifying glycogen in biological samples.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Analytical Chemistry

    Background:

    • Glycogen is a crucial energy storage polysaccharide in animals.
    • Accurate quantification of tissue glycogen is essential for understanding metabolic processes.
    • Existing methods for glycogen determination can be complex or lack sensitivity.

    Purpose of the Study:

    • To develop and validate a specific and simple enzymatic method for determining glycogen content in tissue.
    • To establish a low detection limit for glycogen analysis.
    • To apply the method for quantifying glycogen in muscle tissue.

    Main Methods:

    • Enzymatic conversion of glycogen to 6-phosphogluconate using amyloglucosidase, hexokinase, and glucose-6-phosphate dehydrogenase.
    • Fluorometric measurement of the resulting increase in NADPH.
    • Hydrolysis of muscle tissue (5-20 mg) in hot potassium hydroxide (KOH), followed by neutralization and analysis.

    Main Results:

    • The developed method demonstrates a detection limit of approximately 1 microgram of glycogen (6.2 nmol glucosyl residues).
    • The assay is specific and simple, utilizing common enzymes.
    • Glycogen-glucosyl content in wet rat diaphragm muscle was determined to be approximately 43 mmol/kg.

    Conclusions:

    • The described enzymatic method provides a sensitive and straightforward approach for tissue glycogen determination.
    • This assay is suitable for quantifying glycogen in small tissue samples.
    • The method's simplicity and sensitivity make it valuable for metabolic research.

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