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8种药用植物辐射防护作用的药学研究进展_2028
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官方公共微信Characterization of an acetylated heteroxylan from Eucalyptus globulus Labill.
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2003 Mar 28;338(7):597-604.Characterization of an acetylated heteroxylan from Eucalyptus globulus Labill.1, , , .1CICECO and Department of Chemistry, University of Aveiro, P , Aveiro, Portugal. dmitry@dq.ua.ptAbstractA heteroxylan was isolated from Eucalyptus globulus wood by extraction of peracetic acid delignified holocellulose with dimethyl sulfoxide. Besides (1--&4)-linked beta-D-xylopyranosyl units of the backbone and short side chains of terminal (1--&2)-linked 4-O-methyl-alpha-D-glucuronosyl residues (MeGlcA) in a 1:10 molar ratio, this hemicellulose contained galactosyl and glucosyl units attached at O-2 of MeGlcA originating from rhamnoarabinogalactan and glucan backbones, respectively. About 30% of MeGlcA units were branched at O-2. The O-acetyl-(4-O-methylglucurono)xylan showed an acetylation degree of 0.61, as determined by 1H NMR spectroscopy, and a weight-average molecular weight (M(w)) of about 36 kDa (P=1.05) as revealed from size-exclusion chromatography (SEC) analysis. About half of the beta-D-xylopyranosyl units of the backbone were found as acetylated moieties at O-3 (34 mol%), O-2 (15 mol%) or O-2,3 (6 mol%). Practically, all beta-D-xylopyranosyl units linked at O-2 with MeGlcA residues were 3-O-acetylated (10 mol%).PMID:
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药物控制释放用天然多糖载体的制备技术研究进展_侯晓晖
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, 1 October 2010, Pages 572–576
Structural analysis of a rhamnoarabinogalactan from the stems of Dendrobium nobile Lindl, , , ,
School of Biotechnology and Food Engineering, Hefei University of Technology, Hefei 230009, People&s Republic of ChinaA water-soluble heteropolysaccharide DNP-W3 with a molecular mass of 710 kDa was obtained from the stems of Dendrobium nobile   Lindl, a well-known edible and medicinal plant in Southeast Asia. It had [α]D20 +19.6& (c 0.5, H2O) and contained galactose, rhamnose and arabinose in a molar ratio of 3.1:1.1:1.0. Structural features of the purified polysaccharide were elucidated by a combination of chemical and instrumental techniques, including FT-IR, GC&MS, periodate oxidation&Smith degradation, methylation analysis, partial acid hydrolysis, and NMR. The results indicated that the polysaccharide had a backbone of (1 & 3)-linked β-d-galactopyranosyl residues, with occasionally branches at O-4. The branches were mainly composed of (1 & 4)-linked α-l-rhamnopyranosyl residues and terminated with β-l-arabinopyranosyl residues. Bioactive tests in vitro revealed that DNP-3 could stimulate ConA and LPS-induced T and B-lymphocyte proliferation. It was suggested that DNP-3 could be a potential immunostimulant used in the food industry.KeywordsDendrobium nobile Lindl; Polysaccharide; Structure; Immunological activity
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