Use of cation-exchange resin for the detection of alkylpyridines in beer.
A method has been devised whereby trace amounts of certain basic compounds, such as pyridines, may be detected and semi-quantified in beer in the presence of an excess of other flavour constituents including pyrazines. The method involves steam distillation of beer under reduced pressure and subsequent passage of the distillate through a column of weakly acidic Zerolit cation-exchange resin. The resin is eluted with aqueous sodium chloride, the eluate extracted with organic solvent and the concentrated extract analysed by gas chromatography coupled with mass spectrometry. Using this technique with multiple ion detection, a series of alkylpyridines was readily detectable in beers and worts at levels below 1 ppb.
D001515:Beer / Q000032:analysis*; D002852:Chromatography, Ion Exchange / Q000379:methods*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D011725:Pyridines / Q000032:analysis*
D011725:Pyridines