GRAIN FRACTIONATION

摘要

A method is described for obtaining dextrin-enriched and beta-glucan-enriche d fractions from barley flour. In particular, barley flour is mixed or ground in about 6 0% ethanol at boiling temperature, then dextrinized by addition of thermostable alpha- amylase into the aqueous ethanol and relaxing at boiling temperature. The dextrinized mixture is filtered such that beta-glucan is retained on the filter and dextrin is in the filtrate. To increase the purity of the beta-glucan to at least > 45% db and to increase the de xtrin yield, the beta-glucan residue is resuspended in 60% ethanol and treated a second time with alpha amylase and filtered as previously noted. After alcohol is evaporated from the combined filtrates, the dextrin is spray dried into a powder.