Results 71 to 80 of about 145 (122)

Synthesis, Characterization, and Crystal Structure of Sodium (Methyl α-d-Mannopyranosid)uronate Monohydrate

Synthesis, 2014
TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl)-mediated oxidation of methyl α- d -mannopyranoside with sodium hypochlorite gave sodium (methyl α- d -mannopyranosid)uronate, which was obtained as a crystalline monohydrate in ~70% yield without chromatography.
Pavol Kováč, Peng Xu, Zbigniew Dauter
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The first moenomycin antibiotic without the methyl-branched uronic acid constituent.- Unexpected structure activity relations

Tetrahedron, 1993
Abstract Isolation and structure elucidation of a new moenomycin antibiotic (C1, 1e) that lacks the branching methyl group in the 4-position of unit F are reported. The smallest antibiotically active degradation product of 1e is the trisaccharide derivative 3.
Martina Heßler-Klintz, Kurt Hobert, Armin Biallaß, Torsten Siegels, Monika Hiegemann, Armin Maulshagen, Dietrich Müller, Peter Welzel, Gerhard Huber, Dirk Böttger, Astrid Markus, Gerhard Seibert, Andreas Stärk, Hans-Wolfram Fehlhaber, Yveline van Heijenoort, Jean van Heijenoort   +15 more
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Structural and Mechanistic Insights into the Formation of Xanthylium Chromophores in Uronic Acid Quantification

Journal of Agricultural and Food Chemistry
The Blumenkrantz-Asboe-Hansen assay is the most widely used colorimetric method for quantifying uronic acids (UAs), key components of pectins, and plant cell wall polysaccharides. However, the molecular origin of the assay's pink coloration remained unresolved.
Johanna Braun, Angela Bihlmeier, Mirko Bunzel   +2 more
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Studies on uronic acid materials. Part XXI. Some structural features of Acacia arabica gum

Journal of the Chemical Society C: Organic, 1967
The polysaccharide exuded by Acacia arabica trees has a high positive specific rotation and contains residues of D-galactose, L-arabinose, L-rhamnose, D-glucuronic acid, and 4-O-methyl-D-glucuronic acid. Linkage analysis affords 3-O-β-L-arabinopyranosyl-L-arabinose and 3-O-β-L-arabinofuranosyl-L-arabinose.
D. M. W. Anderson, Edmund Hirst, J. F. Stoddart   +2 more
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¹³C NMR study of presence of uron structures in amino adhesives and relation with wood‐based panels performance

Journal of Applied Polymer Science, 2013
ABSTRACTThe chemical structure of amino adhesives produced by the strongly acid process was investigated by 13C Nuclear Magnetic Resonance spectroscopy. This technique allowed the identification of functional groups and its quantitative determination. Concentration of cyclic polymeric structures (urons) was shown to be related with adhesive performance
Nuno A. Costa, Daniela Martins, João Pereira, Jorge Martins, João Ferra, Paulo Cruz, Adélio Mendes, Fernão D. Magalhães, Luísa H. Carvalho   +8 more
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Studies on uronic acid materials. Part XVII. Some structural features of Acacia senegal gum (gum arabic)

Journal of the Chemical Society C: Organic, 1966
Acacia senegal gum is subjected to seven successive Smith degradations. The O-methyl derivatives of each of the polysaccharides obtained from the first five degradations are analysed, after methanolysis, by gas–liquid partition chromatography. After the fifth degradation, the O-methyl sugars characterised from the methylated polysaccharide are 2,3,4,6 ...
D. M. W. Anderson, Edmund Hirst, J. F. Stoddart   +2 more
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ChemInform Abstract: The First Moenomycin Antibiotic Without the Methyl‐Branched Uronic Acid Constituent. Unexpected Structure Activity Relations

ChemInform, 1993
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
M. HESSLER‐KLINTZ, K. HOBERT, A. BIALLASS, T. SIEGELS, M. HIEGEMANN, A. MAULSHAGEN, D. MUELLER, P. WELZEL, G. HUBER, D. BOETTGER, A. MARKUS, G. SEIBERT, A. STAERK, H.‐W. FEHLHABER, Y. VAN HEIJENOORT, J. VAN HEIJENOORT   +15 more
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ChemInform Abstract: Sigmatropic Rearrangement of Uronic Acid Derived Saccharide Allyl Ketene Acetals. A Study of Stereochemistry and Structural Limitations.

ChemInform, 1999
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Barbara Werschkun, Joachim Thiem
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Crystal Structures of Methyl (Methyl 3-azido-2,3-dideoxy-β-L-lyxo- and -β-D-arabino-hexopyranosid)uronates

Journal of Carbohydrate Chemistry, 2010
Single-crystal x-ray diffraction data for methyl (methyl 3-azido-2,3-dideoxy-β-L-lyxo- and β-D-arabino-hexopyranosid)uronates are presented. Three independent molecules in the asymmetric part of the unit cell of the β-D-arabino stereoisomer were found. These differ slightly in the geometry of the groups bound to the pyranose rings.
Dorota Tuwalska, Damian Trzybiński, Artur Sikorski, Beata Liberek   +3 more
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Structure-function insights into bile acid binding of kiwifruit polysaccharides: Roles of Uronic acids, molecular weight, and viscosity

International Journal of Biological Macromolecules
Dietary polysaccharides can sequester bile acids, thereby supporting cholesterol regulation and cardiovascular health, yet the structural determinants of this interaction remain insufficiently defined. In this study, kiwifruit polysaccharides (KFP) were extracted and systematically subjected to simulated gastrointestinal digestion, colonic fermentation,
Zhengmei, Ji, Pengfei, Liang, Shaoxiong, Li, Suping, Zhu, Shuqi, Zhang, Ming, Xu, Qingfeng, Li, Jirong, Zhao, Xiangqian, Zhang, Yurong, Guo, Yanhui, Han   +10 more
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