abstract |
Hulupones are made from lupulones, the beta-resin acids from hops by oxidn. in aq. alkali, pref. Na2CO3, NaOH or KOH, with an oxidising agent, pref. O2 or air, in the presence of MnO2, V2O5 and zeolitic rare earths as catalyst. After oxidn. the hulupones are pptd. from the soln. and are added to the wort or beer. |