A method has been developed for the simultaneous analysis of biogenic amines, amino acids, and the ammoniumion in wine and beer. Aminoenones formed by the reaction of amino acids, biogenic amines, and the ammoniumion with the derivatization reagent diethyl ethoxymethylenemalonate are separated by HPLC. Reaction takes place in methanolic alkaline medium for 30 min in an ultrasonic bath. Further heating