title: [Polysaccharides of diatoms occurring in Lake Baikal].
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-beta-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 beta-1-->6-bound glucose residues. The chrysolaminaran from A. baicalensis is a low-molecular-weight 1-->3:1-->6-beta-D-glucan containing a small number of beta-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-molecular-weight (2-kDa) glycoprotein, the carbohydrate moiety of which is represented by a heteropolysaccharide.
authors.forename: S A
authors.initials: SA
authors.lastname: Alekseeva
authors.forename: N M
authors.initials: NM
authors.lastname: Shevchenko
authors.forename: M I
authors.initials: MI
authors.lastname: Kusaĭkin
authors.forename: L P
authors.initials: LP
authors.lastname: Ponomorenko
authors.forename: V V
authors.initials: VV
authors.lastname: Isakov
authors.forename: T N
authors.initials: TN
authors.lastname: Zviagintseva
authors.forename: E V
authors.initials: EV
authors.lastname: Likhoshvaĭ
mesh_terms: D008970:Molecular Weight; D019906:Nuclear Magnetic Resonance, Biomolecular; D011134:Polysaccharides / Q000737:chemistry / Q000302:isolation & purification*; D012800:Siberia
chemical_list: D011134:Polysaccharides