This method describes the determination of dimethyl sulfide and its precursors in malt.
Malt intended for use in beer brewing or elsewhere in the food industry
DMS and the precursors of DMS (DMSP) are obtained from a finely ground malt sample by means of cold extraction. This aqueous extract is then boiled under alkaline conditions which converts the DMS precursors (DMSP) to free DMS. The DMS is determined using gas chromatography by means of the headspace technique.
Determination of free dimethyl sulfide (DMS) and its precursors in beer
wort
Dimethyl sulfide precursors (DMSP) in the wort are converted to dimethyl sulfide (DMS) by heating under aqueous, alkaline conditions. The DMS is determined using gas chromatography by means of the headspace technique.
Determination of free dimethyl sulfide (DMS) and its precursors in wort and beer
wort and beer
Free DMS is determined in wort and beer with a gas chromatograph using the headspace method. Calibration is performed at various concentrations within the relevant range. The relative peaks corresponding to the concentrations are evaluated.
Determination of organic acids using ion chromatography
This method is suitable for beer, wort, green beer, NAB, water and wastewater
Separation by ion chromatography followed by conductivity detection.