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pubmed-article:18039538pubmed:abstractTextThe heteroxylan from the hybrid Paulownia elongata/Paulownia fortunei is an O-acetyl-(4-O-methylglucurono)xylan with an acetylation degree (DS) of 0.59 and a molecular weight (M(w)) of 29 kDa. The heteroxylan backbone is composed by (1-->4)-linked beta-d-xylopyranosyl units (Xylp) partially ramified with terminal (1-->2)-linked 4-O-methyl-alpha-D-glucuronosyl (MeGlcpA) and a small proportion of alpha-D-glucuronosyl (GlcpA) residues in a molar ratio of Xylp:(MeGlcpA+GlcpA) of 20:1. Roughly half of the beta-D-xylopyranosyl units in the backbone are acetylated: 3-O-acetylated (22 mol %), 2-O-acetylated (23 mol %) or 2,3-di-O-acetylated (7 mol %). ESI-MS and MALDI-MS studies of partially hydrolyzed heteroxylan revealed a random distribution of O-Ac and MeGlcpA within the backbone. However, the frequency of substitution with O-Ac along the backbone is not uniform and the molecular regions that did not contain MeGlcpA substituents possessed an acetylation degree significantly lower than the average DS of the xylan.lld:pubmed
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pubmed-article:18039538pubmed:year2008lld:pubmed
pubmed-article:18039538pubmed:articleTitleStructural characterization of the acetylated heteroxylan from the natural hybrid Paulownia elongata/Paulownia fortunei.lld:pubmed
pubmed-article:18039538pubmed:affiliationMass Spectrometry Center/Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal.lld:pubmed
pubmed-article:18039538pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:18039538pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed