Study on Production and Physiochemical Characteristics of Waste Beer Yeast Extract by Autolysis-enzymolysis Method

The autolysis-enzymolysis method was adopted to prepare yeast extract in order to make full use of the waste beer yeast.The key factors influencing the autolysis of waste beer yeast were optimized,including autolysis promoter,autolysis time and enzymolysis time.Results showed that the autolysis-enzymolysis method was suitable for the yeast extract production.Under the optimized conditions,the yields of amino nitrogen,total nitrogen and solid reached 4.30%、8.98% and 59.0%,respectively.Furthermore,the physiochemical characteristics of the achieved yeast extract were investigated.