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Selective microdetermination of lipid hydroperoxides.

P J Marshall, M A Warso, W E Lands

    Analytical Biochemistry
    |February 15, 1985
    PubMed
    Summary

    A new assay accurately measures lipid hydroperoxides using prostaglandin H synthase activity. This method is 50-fold more sensitive than current assays, revealing lower physiological levels of lipid hydroperoxides in human plasma.

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    Area of Science:

    • Biochemistry
    • Analytical Chemistry

    Background:

    • Lipid hydroperoxides are key markers of oxidative stress.
    • Current assays often lack sensitivity and measure secondary products, leading to overestimation.

    Purpose of the Study:

    • To develop a sensitive and selective assay for direct measurement of lipid hydroperoxides.
    • To compare the new assay's performance against existing methods.

    Main Methods:

    • Utilized the cyclooxygenase activity of prostaglandin H synthase, activated by hydroperoxides.
    • Measured the direct enzymatic response to lipid hydroperoxides.
    • Applied the assay to human plasma samples.

    Main Results:

    • The assay demonstrated linearity between 10-150 pmol of lipid hydroperoxide.
    • Achieved approximately 50-fold greater sensitivity compared to the thiobarbiturate assay.
    • Quantified normal human plasma lipid hydroperoxides at 0.5 microM, significantly lower than thiobarbiturate assay estimates (30-50 microM).

    Conclusions:

    • The developed enzymatic assay provides a highly sensitive and selective method for quantifying lipid hydroperoxides.
    • Revealed significantly lower physiological concentrations of lipid hydroperoxides than previously estimated.
    • The measured physiological levels approach concentrations known to impact vascular prostacyclin synthase.

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