Showing papers in "Carbohydrate Research in 1988"

TL;DR: A computerised approach to the structural analysis of unbranched regular polysaccharides is described, which is based on an evaluation of the 13C-n.r.m. spectra for all possible primary structures within the additive scheme starting from the chemical shifts of the13C resonances of the constituent monosaccharides and the average values of the glycosylation effects.

TL;DR: In this paper, the mechanism of action of α- l -arabinofuranosidase, α - l -rhamnopyranosidases, and β- d -glucopyranoidase on p -nitrophenyl and grape monoterpenyl disaccharide-glycosides has been studied.

TL;DR: A revised CHARMM-type molecular mechanics potential-energy function has been developed for use in the dynamical simulation of simple carbohydrates in aqueous solution and was found to produce a D-glucose molecule less flexible in vacuo than had been previously observed.

TL;DR: Comparison of the rate of acid-catalysed hydrolysis of the glycosidically bound phosphate present in this "isolated Lipid A" preparation with that of 2-deoxy-2-[(3R)-3-hydroxytetradecanamido]-alpha- and -beta-D-glucopyranose 1-phosphates established that the former 1- phosphate was the alpha anomer.

TL;DR: In this paper, a stoichiometric relationship between fatty acids and amylose was discussed in the light of a stochastic relationship between amyloses and fatty acid complexes.

TL;DR: In this paper, the influence of monovalent cations on the molecular geometry of gellan has been investigated by X-ray diffraction analysis of oriented fibers of the potassium salt.

TL;DR: Light scattering and viscosity measurements on dilute or moderately concentrated solutions of chitin in N,N -dimethylacetamide (DMAc) containing 5% or 8% of LiCl are reported in this article.

TL;DR: In this paper, a successful re-examination of the crystal structure of gellan is described, showing that the gellans chains have backbone conformations different from those previously considered.

TL;DR: In this article, the ordered conformation of kappa-carrageenan molecules in condensed but well-hydrated systems has been investigated by refining stereochemically plausible models to fit the continuous X-ray diffraction data obtained from oriented fibers.

TL;DR: In this paper, the non-Newtonian behavior and dynamic viscoelasticity of a series of aqueous solutions of agarose were measured with a rheogoniometer.

TL;DR: 3JC,H values have been measured using selective 2D heteronuclear J-resolved n.m.r. spectroscopy for the COCH fragment in various carbohydrates and a Karplus-type relationship between 3JCOCH and dihedral angles in sugar is characterised.

TL;DR: In this paper, the 400 MHz 1 H-n.m. spectra of pectins with various degrees of esterification (d.r.e.), as obtained by methylation and subsequent partial saponification, have been measured.

TL;DR: In this article, aldohexopyranose residues have been studied on the basis of the inter-unit n.O. and theoretical calculations using atom-atom potential functions.

TL;DR: A common mechanism for gel-formation in gastric, duodenal, and colonic mucus was interpreted to show that the polymeric structure of mucus glycoproteins confers the three-dimensional structure necessary for formation of the gel network.

TL;DR: Synthese de disaccharides par couplage d'un thioglycoside and D'un glycoside in presence of bromure d'acide nitro-2 benzenesulfinique ou de methylsulfenyl triflate

TL;DR: In this article, the neutral sugar side-chains of pectic substances extracted with water (WSP), dilute HCl (HP), and endopectinlyase (AIR/PEL) from an alcohol-insoluble residue (AIR) from the pulp of grape berries were investigated by using chemical methods (methylation, carboxyl-reduction, and periodate oxidation), enzymic degradation with an α- l -arabinofuranosidase, and 13 C-n.m.

TL;DR: In this paper, the cell-wall material of kiwifruit (Actinidia deliciosa) was isolated from cryo-milled (− 196°) powders prepared from 4 different tissue zones of the fruit and polysaccharides were solubilised by stepwise extraction with cyclohexane-trans-1,2-diaminetetra-acetate (CDTA), 0.05 m Na2CO3, 6 m guanidinium thiocyanate (GTC), and 4 m KOH.

TL;DR: Deoxy- d - lyxo -heptulosaric acid (DHA) has been identified as a component of plant cell walls and was found to be present in the primary cell walls of many higher plants, including several dicots, two monocots, and a gymnosperm, but was not detected in two bacterial lipopolysaccharides.

TL;DR: The β-d-galactosidase-catalysed reactions were efficient enough to allow the one-pot preparation of the various β-linked mono- and di-Galactosides from lactose and alcohol.

TL;DR: Etude de la retrogradation par sdf deconvolution. Variations des spectres avec le temps moins importantes qu'avec l'amidon de mais cireux, dues a la cristallinite, du fait de sa moindre teneur en amylopectine as discussed by the authors.

TL;DR: Rhamnogalacturonan-II, isolated from the cell walls of suspension-cultured sycamore cells, has been further characterized and found to contain a large number of branched galactosyluronic acid residues that have not yet been identified as components of oligosaccharide fragments, although they are undoubtedly part of an octa(galactosyuronic Acid) fragment generated by partial acid hydrolysis.

TL;DR: Six analogs of the trisaccharide 8-methoxycarbonyloctyl 6-O-[2-O-(2-acetamido-2-deoxy-beta-D-glucopyranosyl)-alpha- D-mannopyrano syl] -beta-C-Glc rho-O(CH2)7 CH3 have been chemically synthesized and evaluated as GnT-V acceptors, providing evidence for the conform

TL;DR: The carbohydrate-binding specificities of lectins purified from Agaricus bisporus (ABA-I), Arachis hypogaea (PNA), Bauhinia purpurea (BPA), Glycine max (SBA), and Vicia villosa (VVA-B4) have been studied by affinity Chromatography on columns of the immobilized lectins, and quantitatively analyzed by frontal affinity chromatography.

TL;DR: The results suggest that 6'-OH----O-2 H-bonding is significant in the minimal-energy orientation of M, with phi = -36 degrees and psi = 51 degrees, and that two other glycosidic orientations may be important in the 2-O- or 6- O-substituted derivatives of M.

TL;DR: Batch-to-batch variation was observed in the relative amounts of the two polysaccharides, the acetyl and pyruvic contents of EPS-I, and the degree of acetylation of EPS -II.

TL;DR: In this article, conditions have been devised for the quantitative precipitation of the branched fraction in starches by concanavalin A and the enzymic estimation of the α-d -glucan in this and the soluble components.