Showing papers in "Carbohydrate Research in 1992"

TL;DR: In this paper, the disruption of molecular oders which occur during the gelatinisation of starch granules has been studied by isolating dried samples from maize, waxy maize, wheat, potatoe, and tapioca starches after defined thermal pre-treatments.

TL;DR: In this paper, the authors showed that the molecular structure of the microcrystalline region is the same in the four granular starches, and that T o is controlled indirectly by the surrounding amorphous regions.

TL;DR: Nortropanoline is a novel tropane alkaloid and a new type of polyhydroxylated alkaloidal glycosidase inhibitors, which are the first naturally occurring glycosides of 1 and 5, respectively.

TL;DR: Values of Kloc(B-L) were obtained, which appear to be characteristic of the configuration concerned, and explain the favourable effect of borate in the alkaline isomerisation of lactose into lactulose.

TL;DR: Anomerically enriched diphenyl hexopyranosyl phosphate triesters have been prepared from O -alkyl and -acylated hexoprinoses, using diphenynyl chlorophosphate and 4- N,N -dimethylaminopyridine as mentioned in this paper.

TL;DR: Oligosaccharides obtained from alkali-extractable wheat-flour arabinoxylans by digestion with endo-(1 → 4)-β- d -xylanase from Aspergillus awamori were fractionated by size-exclusion chromatography on Bio-Gel P-2 followed by high-performance anion-exchange chromatography, and subjected to monosACcharide analysis and 1 H NMR spectroscopy.

TL;DR: Methylation analysis and 1H and 13C NMR spectroscopy showed PS-I to have the structure [formula: see text] where 6dmanHep is the unusual higher sugar 6-deoxy-D-manno-heptose.

TL;DR: The results indicate that the effects of the fucan sulfate are dependent on its sulfate content until a plateau is reached.

TL;DR: A cold-water-soluble wheat-endosperm arabinoxylan consisting of a backbone of (1----4)-linked beta-D-xylopyranosyl residues that are variously unsubstituted, and 3- or 2,3-substituting with single alpha-L-arabinofuranosyl groups, was subjected to 1H-n.m.r.r spectroscopy.

TL;DR: Relaxed-residue energy maps based on the MM3 force-field were computed for relative orientations of the pyranosyl rings of sophorose, laminarabiose, and cellobiose, respectively, showing good agreement between disaccharide structures having minimal MM3 energy and those found by crystallography.

TL;DR: The extracellular polysaccharide obtained from slime-forming Lactococcus lactis subsp.

TL;DR: The ability to prepare a immunologically active, water-soluble (1-->3)-beta-D-glucan preparation will greatly enhance the clinical utility of this class of compounds.

TL;DR: In this paper, the existence of an HO-3⋯O-5′ intramolecular hydrogen bond in methyl β-cellobioside in solution in Me 2 SO-d 6 and H 2 O-CD 3 OD (4:1 w/w) was studied by 500-MHz 1 H-NMR spectroscopy and MD simulations.

TL;DR: The structures of hepta- to tetradeca-saccharides, generated by digestion of wheat-endosperm arabinoxylan with endo-(1----4)-beta-D-xylanase, and isolated by gel-permeation chromatography on Bio-Gel P-6 and high-performance anion-exchange chromatography with pulsed amperometric detection, were elucidated using monosaccharide and methylation analysis.

TL;DR: Torsional conformations of known crystal structures of maltosyl-containing molecules lie in a lower MM3 energy range than previously reported, illustrating the importance of the exo-anomeric effect and linkage type in determining the conformational flexibility of disaccharides.

TL;DR: The total synthesis of the GPI anchor of Trypanosoma brucei was achieved for the first time and the introduction of two phosphodiester functions was efficiently achieved using the H-phosphonate method.

TL;DR: The L-glyceryl groups do not allow the gellan-like coordinated interactions of the ions and the carbohydrate groups, within and between double helices, which are necessary for strong gelation.

TL;DR: In this article, the structure of bovine lactotransferrin glycopeptides was determined by application of methanolysis, methylation analysis, fast atom bombardment mass spectrometry, and 1H NMR spectroscopy.

TL;DR: The structure of the exopolysaccharide of Lactococcus lactis subsp.

TL;DR: There was a marked preference of CBH-I to attack the first three linkages at the reducing ends of the cello-oligosaccharides (cellotriose-cellohexaose).

TL;DR: Structural methods included 1H- and 13C-NMR spectroscopy, methylation linkage analysis, fast atom bombardment mass spectrometry of methylated glycans, and selective fragmentations by the Smith degradation and N-deacetylation-nitrous acid deamination.

TL;DR: In this paper, the heat capacity of amorphous amylopectin/water mixtures was investigated as a function of temperature and composition by differential scanning calorimetry.

TL;DR: Under optimal conditions for the culture of the fungus Phytium aphanidermatum, no polysaccharides were excreted into the medium and the storage glucan and the hot-water-soluble cell-wall glucan exhibited strong activity against the Sarcoma 180 in CD-1 mice, whereas the acid- solubilised cell- wall glucans were inactive.

TL;DR: In this paper, a homogeneous bromination of cellulose with N -bromosuccinimide-triphenylphosphine in LiBr-DMA was studied.

TL;DR: The selective synthesis of β-d -mannosides was achieved by first synthesizing β- d -glucosides that carry a N -phenyl carbamoyl protecting group at O-3, the O -triflyl group being the leaving group as mentioned in this paper.

TL;DR: The structure of an arabinogalactan-protein (AGP) isolated from grape juice was studied by methylation analysis, n.r.m. spectroscopy, and interactions with peanut lectin, after specific degradation with purified enzymes and/or Smith degradation.

TL;DR: A single myeloid-like pattern of (1----3)-alpha-L-fucosyltransferase activity was found at early stages of development in all tissues tested and was later progressively replaced by enzymes or mixtures of enzymes having the corresponding adult patterns of enzyme expression.

TL;DR: Compared with solution NMR data, structures obtained from single crystal diffraction studies, and with previous reports of the 13C-CP/MAS NMR spectra, the results suggest that, for resonances of carbon atoms close to a centre of significant conformational change, chemical shifts may be predicted on the basis of conformation alone, but for more distant atoms, changes in chemical shift may be masked by the effects of alterations in the local environment.