Abstract:The activities of β-glucanase,xylanase,protease and cellulase produced by 40 strains of Geotrichum candidum were studied in this manuscript.The weighted mark method was used to analyze activities of the above enzymes,and four G.candidum strains including No.3,No.12,No.18 and No.39 were selected as the malting microbial strains.The malting trials indicated that four G.candidum strains could improve the modification of malt and No.12 was the best one.Compared with that of the control,β-glucan content in final malt produced by G.candidum No.12 was decreased by 17.8%,and filtration volume in sixty minutes,diastatic power and free amino nitrogen content increased by 35.4%,10.3% and 7.3%,respectively.Meanwhile,other characteristics of the final malt met the requirement of QB1686-2008.The results of fermentation experiment shown that the brewing characteristics of microbial malt was better than that of the control malt,and the beer brewed with microbial malts or control malts both met the requirement of GB4927-2008.
