Isolation and characteristics of Geotrichum candidum in the micromalting

Two strains of fungus were isolated from Gansu NO.3 beer barley.The two strains were primarily identified as Geotrichum candidum Link GQG28-1 and Geotrichum candidum Link GQG28-2,respectively,by identification of physiological and biochemical properties and the activities of β-glucanase,xylanase,protease and glucamylase produced.The results of growth characteristics of G.candidum Link GQG28 showed that the optimum growing temperature was 25℃ in the range of 5℃~37℃.The optimum pH was 5.6 and it could grow at pH 3.2-11.0.The practical malt quality was 206.15,the saccharification rate of malt was 308.5WK,the α-amino state nitrogen was 186mg/100g,and the extraction rate was 87.1% when G.candidum Link is used.