Determination of sulfite in beer based on fluorescent derivatives and liquid chromatographic separation

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    Abstract

    A method was developed for quantification of sulfite in beer based on derivatization with the maleimide-derived probe ThioGlo 1 followed by separation of fluorescent adducts by reversed-phase high-performance liquid chromatography and fluorescence detection. Sulfite gave two ThioGlo 1 derivatives and it was shown by mass spectrometry that both had identical mass spectra. Matrix effects were observed when constructing sulfite standard curves in different beers and, therefore, use of a matrixmatched calibration curve is proposed. ThioGlo 1 was found to generate fluorescent adducts with both bound and free sulfite, providing a quantification of the total sulfite content in beer. The limit of quantification of sulfite was 0.6 mg/L and the method can be used for quantification of sulfite in highly colored beers.

    OriginalsprogEngelsk
    TidsskriftJournal of the American Society of Brewing Chemists
    Vol/bind70
    Udgave nummer4
    Sider (fra-til)296-302
    Antal sider7
    ISSN0361-0470
    DOI
    StatusUdgivet - 2012

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