[Determination of the primary and fine structures of galactomannan from seeds of Gleditsia triacanthos f. intermis L].
This was the first study to isolate galactomannan, a 660-kDa polysaccharide, from the seeds of Gleditsia triacanthos f. inermis L. (yield 15.4%). Its aqueous solutions were optically active ([alpha] D = +31.0 degrees) and highly viscous ([eta] = 578 ml/g). The analysis of this heteropolysaccharide using chemical, enzymatic, and chromatographic procedures, as well as IR- and 13C-NMR spectroscopy, showed that is consists of D-mannopyranose and D-galactopyranose residues (molar ratio 2.42:1). Its main chain is comprised of 1,4-beta-D-mannopyranose residues, 41% of which is substituted at C-6 with single residues of alpha-D-galactopyranose. The probability of occurrence of differently substituted mannobiose units in the chain, determined experimentally, was 0.16 for the unit Man-Man, 0.50 for the units Gal(Man-Man) and (Man-Man)Gal, and 0.34 for the dissubstitued unit Gal(Man-Man)Gal.
Egorov
A V
AV
Bach Institute of Biochemistry, Russian Academy of Sciences, Leninskii pr. 33, Moscow, 119071 Russia.
Mestechkina
N M
NM
Shcherbukhin
V D
VD
D005690:Galactose / Q000031:analogs & derivatives; D031501:Gleditsia / Q000737:chemistry* / Q000201:enzymology; D009682:Magnetic Resonance Spectroscopy; D008351:Mannans / Q000737:chemistry*; D012639:Seeds / Q000737:chemistry*; D013055:Spectrophotometry, Infrared
D008351:Mannans; C012990:galactomannan; D005690:Galactose