Hop extract process and product
Method for processing hops for brewing
Production of iso--acid
Hop extracts and method of preparation Patent #: 4324810
ApplicationNo. 06/728831 filed on 04/30/1985
US Classes:426/600, Hop derived ingredient, including hopping of wort426/431, Liquid is aqueous426/655Extract
ExaminersPrimary: Weimar, Elizabeth C.
Attorney, Agent or Firm
International ClassesC12C 3/12 (20060101)
C12C 3/00 (20060101)
AbstractA hopping material useful as a kettle additive in preparing anactinic malt beverages is prepared by a method which includes first forming an aqueous suspension of crude hops, containing alpha acids and cellulosic material and alkali hydroxide and an alkali borohydride. The suspension, which has a pH above about 10.5, is heated to isomerize and reduce the alpha acids initially present in the hops. The pH is lowered to about 2 to convert the reduced iso-alpha acids to their free acid forms so that they are adsorbed on cellulosic hop material in the reaction mixture. The cellulosic material which now contains the free isomerized and reduced alpha acids is isolated and is useful as an anactinic kettle additive which can be stored for prolonged periods with no decomposition. If desired, the cellulosic material thus obtained can be further treated by adjusting the pH with an alkaline solution to obtain an aqueous solution containing only reduced iso-alpha acids, which is useful as an anactinic post-kettle additive, and a cellulosic material, which is useful as an anactinic kettle additive.