No abstract

No abstract

Polysaccharide composition of neutral, acid-and alkali-soluble fractions of the diatoms Stephanodiscus meyerii Genkal et Popovsk and Aulacoseira baicalensis (K. Meyer) Simonsen of Lake Baikal has been studied. Neutral polysaccharides were represented by chrysolaminarans ( 1 3; 1 6-β -D -glucans). The chrysolaminaran from S. meyerii consists of the high-and low-molecular-weight fractions (40 and 2-5 kDa, respectively) and contains a large number of β -1 6 -bound glucose residues. The chrysolaminaran from A. baicalensis is a low-molecular-weight 1 3; 1 6-β -D -glucan containing a small number of β -1 6-bonds, with mannitol being attached to the reducing unit of its chain. Acid-and alkali-soluble polysaccharide fractions are practically absent in S. meyerii . The alkali-soluble fraction from A. baicalensis is a low-molecularweight (2-kDa) glycoprotein, the carbohydrate moiety of which is represented by a heteropolysaccharide.

No abstract