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DOPA stability in plasma and plasma extracts

H E Spiegel, V Kucera

    Research Communications in Chemical Pathology and Pharmacology
    |August 1, 1978
    PubMed
    Summary
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    Levodopa (L-DOPA) in plasma samples remains stable for at least two weeks when refrigerated or frozen. This stability simplifies sample handling and transport for clinical settings, especially remote ones.

    Area of Science:

    • Pharmacology
    • Clinical Chemistry
    • Biochemistry

    Background:

    • Levodopa (L-DOPA) is a crucial medication for Parkinson's disease.
    • Accurate quantification of L-DOPA in plasma is essential for therapeutic drug monitoring.
    • Challenges exist in sample collection and processing, particularly in remote clinical settings.

    Purpose of the Study:

    • To assess the stability of L-DOPA in unextracted heparinized plasma samples under common storage conditions.
    • To determine the feasibility of storing plasma samples for extended periods before analysis.

    Main Methods:

    • Unextracted heparinized plasma samples containing L-DOPA were subjected to refrigeration and freezing.
    • Samples were stored for a minimum of two weeks.
    • Drug losses were quantified to assess stability.

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    Main Results:

    • Negligible losses of L-DOPA were observed in plasma samples stored under refrigeration or freezing for at least two weeks.
    • The stability of L-DOPA was confirmed under these conditions.

    Conclusions:

    • L-DOPA is stable in unextracted heparinized plasma for at least two weeks when refrigerated or frozen.
    • This stability simplifies sample logistics, enabling reliable L-DOPA analysis even from remote clinical sites.