[Comparative study of the pullulans synthesized by Pollularia (Aureobasidium) pullulans strains of different...

Pullularia pullulans strains of different ploidy synthesize pullulans similar in their characteristics to those described in literature. These are glucans whose glucose residues are linked with alpha(1 leads to 4) and alpha(1 leads to 6) bonds in the proportion of 2.2:1. The pullulans differ from one another in their water solubility, molecular mass and in the ability to be cleaved by alpha-amylase and dextranase. The minor structural modifications of pullulan molecules in the polyploid strains as compared to the pullulan synthesized by the parent haploid culture are caused, apparently, by mutations induced with mitotic poisons.