Structure of a heteroxylan of gum exudate of the palm Scheelea phalerata (uricuri)

Phytochemistry
Fernanda F SimasMarcello Iacomini

Abstract

The polysaccharide isolated from the gum exudate of palm Scheelea phalerata (SPN) was water-insoluble and composed of Fuc, Ara, Xyl, and uronic acid moieties in a 5:34:54:7 molar ratio: 12% of phenolics were also present. A soluble polysaccharide (SPNa) was obtained after alkaline treatment, which contained Fuc, Ara, Xyl and uronic acid in a 7:44:42:7 molar ratio, with only 2% phenolics. SPNa had an M(W) approximately 1.04 x 10(5) g mol(-1) and was almost monodisperse (M(W)/M(N) : 1.25 +/-0.22). It had a branched structure with side chains of 2-O-substituted Xylp (approximately 8%) and 3-O-substituted Araf (12%) units, and a large proportion of nonreducing end-units of Araf (15%), Fucp (10%), Xylp (4%), and Arap (6%). The (1 --> 4)-linked beta-Xylp main-chain units were 3-O- (9%), 2-O- (13%), and 2,3-di-O- (13%) substituted. Its (13)C NMR spectrum contained at least 9 C-1 signals, those at delta 108.6 and 107.7 arising from alpha-Araf units. Others were present at delta 175.4 from C-6 of alpha-GlcpA and delta 15.6 from C-6 of Fucp units. The main chain of SPNa was confirmed by analysis of a Smith-degraded polysaccharide (SPDS): methylation analysis provided a 2,3-Me(2)-Xyl (65%) derivative and its (13)C NMR spectrum showed five...Continue Reading

References

Aug 15, 1991·Analytical Biochemistry·T M Filisetti-Cozzi, N C Carpita
Jul 18, 1991·Carbohydrate Research·G O AspinallJ Szafranek

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Citations

Feb 11, 2016·International Journal of Biological Macromolecules·Camila T ScoparoMarcello Iacomini
Dec 12, 2012·Carbohydrate Polymers·Aline GreinIzabel C Riegel-Vidotti
Apr 3, 2013·Carbohydrate Polymers·Fernanda F Simas-TosinPhilip A J Gorin
Apr 8, 2014·Carbohydrate Polymers·Fernanda F Simas-TosinPhilip A J Gorin
Nov 5, 2016·International Journal of Biological Macromolecules·Fatma BouazizSemia Ellouz Chaabouni
Dec 3, 2016·International Journal of Biological Macromolecules·Fatma BouazizSemia Ellouz Chaabouni
Nov 15, 2017·International Journal of Biological Macromolecules·Mudasir BashirTanveer Ahmed

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