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Related Experiment Videos

Sensitive, optimized assay for serum AMP deaminase.

R C Pedersen, A J Berry

    Clinical Chemistry
    |September 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    A new, sensitive assay for serum AMP deaminase was developed using a colorimetric method. This assay accurately measures enzyme activity, aiding in the diagnosis of myopathies and X-linked dystrophies.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Clinical Chemistry

    Background:

    • Serum AMP deaminase (EC 3.5.4.6) is an enzyme of clinical interest.
    • Existing assays may lack sensitivity or optimization for reliable measurement.
    • Elevated levels are associated with myopathies and potential carrier detection for X-linked dystrophies.

    Purpose of the Study:

    • To develop and optimize a sensitive colorimetric assay for serum AMP deaminase.
    • To establish reference ranges for healthy adults.
    • To evaluate the assay's analytical performance.

    Main Methods:

    • Colorimetric indophenol determination of liberated ammonia.
    • Optimization of buffer, pH, ionic strength, and activators.
    • Determination of Michaelis-Menten constant (Km).

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    Main Results:

    • Established average serum AMP deaminase activity in healthy adults as 2.7 U/liter (n=36).
    • Achieved assay sensitivity of 0.2 U/liter with 98-99% analytical recovery.
    • Reported in-run CV of 7.9% and between-run CV of 10.6%.

    Conclusions:

    • The optimized assay is sensitive and reliable for measuring serum AMP deaminase.
    • The assay provides a valuable tool for diagnosing myopathies.
    • It may assist in identifying carriers of X-linked dystrophies.