A kind of mannosan was extracted from beer yeast dregs which came from discarded beer yeast after biological protein extracted and was fractionated by methanol,ethanol and Fehlings solution,etc.

• 以废啤酒酵母制备生物蛋白质后的残余物为材料,经甲醇、乙醇、丙酮以及费林试剂络合法提纯,制取粉末状甘露聚糖。