| abstract |
The present invention relates to a new process for upgrading bitter hop materials by phototransformation.n n n This process is characterized in that the acids a and / or are subjected to photolysis by sunlight to obtain the iso-a acids with a substantially quantitative chemical yield, and the deoxy-a acids (convertible into a acids) with a efficiency up to 80%, said photolysis being carried out by focusing, and possibly concentrating the energy of sunlight using a suitable sensor such as, in particular, a planar photoreactor (64) possibly associated with a concentrator of parabolic or cylindroparabolic solar energy (48).n n n Application to the preparation of beer. |