Effect of Starch Raw Materials on Pullulan Polysaccharide Biosynthesis and the Underlying Physiological Mechanism

In order to investigate the effect of different starch raw materials on pullulan biosynthesis by Aureobasidium pullulans, the starch derived from such crops as cassava, corn, potato, sweet potato and wheat was separately used as carbon source for fermentative production of pullulan polysaccharide. The results showed that cassava starch was beneficial to the biosynthesis of pullulan polysaccharide, and the maximum pullulan yield of 23.96 g/L was obtained. Sweet potato starch was not conducive to the biosynthesis of pullulan polysaccharide, and significantly (P