| Structure of a heteroxylan of gum exudate of the palm Scheelea phalerata (uricuri). | |
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MedLine Citation:
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PMID: 15381006 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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 main signals typical of a (1 --> 4)-linked beta-Xylp units. Methylation analysis of a carboxy-reduced polysaccharide (SPN-CR) revealed a 2,3,4,6-Me(4)-Glc derivative (4%) arising from nonreducing end-units of GlcpA. Alpha-GlcpA-(1 --> 2)-alphabeta-Xy1p and alpha-GlcpA-(1 --> 2)-beta-Xylp-(1 --> 4)-alphabeta-Xylp were obtained via partial acid hydrolysis of SPN, showing the structure of side-chain substituents on O-2 of the main-chain units. |
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Authors:
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Fernanda F Simas; Philip A J Gorin; Marco Guerrini; Annamaria Naggi; Guilherme L Sassaki; Cirene L Delgobo; Marcello Iacomini |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Phytochemistry Volume: 65 ISSN: 0031-9422 ISO Abbreviation: Phytochemistry Publication Date: 2004 Aug |
Date Detail:
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Created Date: 2004-09-21 Completed Date: 2005-02-07 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0151434 Medline TA: Phytochemistry Country: United States |
Other Details:
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Languages: eng Pagination: 2347-55 Citation Subset: IM |
Affiliation:
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Departamento de Bioquímica, Universidade Federal do Paraná, C.P. 19046, CEP 81531-990 Curitiba, PR, Brazil. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Arabinose
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analysis Arecaceae / chemistry* Fucose / analysis Gingiva / chemistry* Magnetic Resonance Spectroscopy Methylation Plants, Medicinal / chemistry* Polysaccharides / chemistry, isolation & purification Uronic Acids / analysis Xylans / analysis, chemistry*, classification, isolation & purification Xylose / analysis |
| Chemical | |
Reg. No./Substance:
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0/Polysaccharides; 0/Uronic Acids; 0/Xylans; 0/Xylose; 147-81-9/Arabinose; 3713-31-3/Fucose |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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