Abstract: In order to stabilize hop products by drying at a circulating air temperature of 60.degree. to 80.degree. C. to a residual moisture content of the dried hop products of between 12 and 14% by weight, the hop product is subjected after drying to a short period of thermal irradiation or to a temperature treatment at 60.degree. to 90.degree. C. under inert gas conditions.

Abstract: A process for the production of isohumulones from a hop extract is described in which the hop extract is mixed in a ratio of 1:2 to 1:50 with aqueous solution by stirring at elevated temperature to obtain a two-phase system, the aqueous phase is separated and the humulones are precipitated therefrom by addition of an alkaline earth metal salt; thereafter isomerization of the alkaline earth humulates to the corresponding alkaline earth isohumulates and if necessary conversion of the later to the free isohumulones is carried out. The free isohumulones thus obtained are used to impart a bitter flavor to beer or worts.