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A rapid method for quantifying chlorogenic acid levels in potato samples.

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    |July 24, 2014
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    Potato skins are rich in chlorogenic acids (CGA), offering potential health benefits. However, CGA levels significantly decrease after storage and in processed potato products.

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    Area of Science:

    • Food Science
    • Analytical Chemistry
    • Nutraceuticals

    Background:

    • Chlorogenic acids (CGA) are abundant in plant foods and linked to health benefits.
    • Potatoes are a dietary staple, but their CGA content is not well-understood.
    • Quantifying CGA is crucial for understanding dietary intake and potential health impacts.

    Purpose of the Study:

    • To develop and apply a method for quantifying CGA in potatoes and potato products.
    • To determine CGA levels in different potato varieties and parts (skin vs. flesh).
    • To assess the impact of storage and processing on CGA content.

    Main Methods:

    • Ultrafiltration for sample preparation.
    • Ultra-high performance liquid chromatography with diode array detection (UHPLC-DAD) for CGA quantification.
    • Stable isotope dilution analysis for quinic acid measurement.

    Main Results:

    • Potato skins contain significantly higher CGA concentrations (37-636 mg/100 g DW) than flesh.
    • Storage reduced potato CGA levels by up to 81%.
    • Potato purees had low CGA content (4-11 mg CGA/100 g DW); caffeic acid was not detected.

    Conclusions:

    • UHPLC-DAD is a suitable method for rapid CGA quantification in potatoes and derived products.
    • Potato skins are a primary source of CGA in tubers.
    • Processing and storage significantly diminish CGA content in potatoes.