Structure and solution properties of tamarind-seed polysaccharide

The major polysaccharide in tamarind seed is a galactoxyloglucan for which the ratios galactose:xylose:glucose are 1:2:25:2.8. A minor polysaccharide (2-3%) contains branched (1---5)-alpha-L-arabinofuranan and unbranched (1---4)-beta-D-galactopyranan features. Small-angle X-ray scattering experiment...

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Bibliographic Details
Published inCarbohydrate research Vol. 214; no. 2; p. 299
Main Authors Gidley, M.J. (Unilever Research Lab., Sharnbrook, Bedford (United Kingdom)), Lillford, P.J, Rowlands, D.W, Lang, P, Dentini, M, Crescenzi, V, Edwards, M, Fanutti, C, Reid, J.S.G
Format Journal Article
LanguageEnglish
Published Netherlands 30.07.1991
Subjects
ADDITIF ALIMENTAIRE
ADITIVOS ALIMENTARIOS
Carbohydrate Conformation
Carbohydrate Sequence
CHEMICOPHYSICAL PROPERTIES
FOOD ADDITIVES
Glucans
GRAINE
Magnetic Resonance Spectroscopy
Molecular Sequence Data
Plants - chemistry
POLISACARIDOS
POLYHOLOSIDE
POLYSACCHARIDES
Polysaccharides - chemistry
PROPIEDADES FISICO-QUIMICAS
PROPRIETE PHYSICOCHIMIQUE
SEEDS
SEMILLA
TAMARINDUS INDICA
Viscosity
Xylans
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Summary:The major polysaccharide in tamarind seed is a galactoxyloglucan for which the ratios galactose:xylose:glucose are 1:2:25:2.8. A minor polysaccharide (2-3%) contains branched (1---5)-alpha-L-arabinofuranan and unbranched (1---4)-beta-D-galactopyranan features. Small-angle X-ray scattering experiments gave values for the cross-sectional radius of the polymer in aqueous solution that were typical of single-stranded molecules. Marked stiffness of the chain (C infinity 110) was deduced from static light-scattering studies and is ascribed partially to the restriction of the motion of the (1---4)-beta-D-glucan backbone by its extensive (approximately 80%) glycosylation. The rigidity of the polymer caused significant draining effects which heavily influenced the hydrodynamic behaviour. The dependence of "zero-shear" viscosity on concentration was used to characterise "dilute" and "semi-dilute" concentration regimes. The marked dependence on concentration in the "semi-dilute" region was similar to that for other stiff neutral polysaccharide systems, ascribed to "hyper-entanglements", and it is suggested that these may have arisen through a tenuous alignment of stiffened chains.
Bibliography:9106868
Q60
Q05
ISSN:0008-6215
1873-426X
DOI:10.1016/0008-6215(91)80037-N