US Patent 11382341 Process for preparing a beverage or beverage component from brewer's spent grains

A process prepares a beverage or beverage component. The process includes an enzymatic treatment of brewer's spent grain including addition of one or a combination of enzymes with alpha-amylase, gluco-amylase, cellulase, xylanase, protease and/or beta-glucanase activity and fermentation by a strain of lactic acid bacteria. The combination of enzymes and enzymatic treatment conditions is such that the lactic acid bacteria produce 4.5 g/L lactic acid and metabolise sugar such that the resulting fermented broth contains less than 2.5% w/w and preferably less than 0.5% w/w residual sugar or the lactic acid bacteria produce 4.5 g/L lactic acid and metabolise sugar such that the resulting fermented broth contains at least 2.5% w/w residual sugar.