啤酒糟中可溶性膳食纤维的提取及化学组成

Study on Isolation and Chemical Compositions of Soluble Dietary Fiber in Beer’s Spent Grains

啤酒糟干基中含有58.7%的膳食纤维、23.0%的可溶性膳食纤维(SDF)、13.6%的可溶性戊聚糖及30.4%的β-葡聚糖。用乙醇沉淀和酶解蛋白质及淀粉可提取16.5%(w/w,db)的SDF。加入蛋白酶和淀粉酶,以及增加提取溶液的温度,均可增加SDF的提取率。木糖和阿拉伯糖是组成SDF的主要单糖,各占60.44%和34.45%,阿木糖比值为0.57。提取的SDF中还含有12.01%的β-葡聚糖、1.16%甘露糖和3.35%半乳糖。

Tht beer's spent grains contained 58.7%(w/w,dry base)dietary fibers,23.0% soluble dietary fibers(SDF),13.6% soluble pentosans and 30.4% β-glucan.We obtained 16.5%(w/w,db)SDF from it by adding ethanol to precipitate SDF.Adding papain and α-amylase to enzymolysis protein and starch and increasing temperature of extracting liquid could all increase the rate of isolated SDF.SDF was composed mainly of xylose(60.44%)and arabinose(34.45%).And the ratio of arabinose to xylose was 0.57.Concentration of β-glucan,mannose and galactose in SDF was 12.01%,1.16%and3.35%respectively.