Showing papers in "Carbohydrate Research in 1977"

TL;DR: Native xanthan shows marked specificity in its interactions with plant glycans, indicating a possible biological role in host-pathogen recognition.

TL;DR: chemical and physical studies showed that the solvolytic desulfation is a useful method applicable to all the known glycosaminoglycuronan sulfates without producing depolymerization or unfavorable chemical changes in the polysaccharide molecules.

TL;DR: The structure of the Pneumococcus type-14 capsular polysaccharide has been reinvestigated by using methylation analysis, different specific degradations, and n.r.m. spectroscopy and it is concluded that the poly Saccharide is composed of tetrasaccharide repeating-units having the structure.

TL;DR: In this paper, the dehydration at 95° of d-fructose (0.25 m -1.0 m ) to 5-hydroxymethyl-2-furaldehyde (HMF) and the rehydration of HMF (0,25-1.5 m) to levulinic and formic acids in 0.5-2 m HCl has been studied.

TL;DR: In this paper, the normal vibrations of β-d -glucopyranose have been investigated using the Urey-Bradley force field, and vibrational assignments of the observed bands are made on the basis of the potential energy distributions.

TL;DR: In this paper, the structure and conformation of (1→3)-β-d -glucan from Lentinus edodes, and its acid-degraded, lower molecular-weight fractions have been investigated by 13C-n.m.

TL;DR: In this paper, the p.m.r spectra of D -glucopyranose and 2-acetamido-2-deoxy derivatives in D 2 O at 25° have been completely interpreted.

TL;DR: In this paper, a symmetry rule was derived relating the sign of the n-band of the carbonyl form to the absolute configuration of the sugar, and the symmetry rule also holds for aldehydo- and keto-sugar peracetates, and for y-lactones substituted with oxygen-containing groups.

TL;DR: In this article, the influence of pH (1 − 6) on the rates and yields in the dehydration of d -fructose to 5-hydroxymethyl-2-furaldehyde (HMF) and the rehydration of HMF to levulinic and formic acids at 175° has been studied by using a stirred tank-reactor.

TL;DR: The key step of the synthesis involves the reaction of glycals [3,4,6,tri-O-acetyl-D-glucal (1), the new glycal derivative 4-Oacetyl, 1,5-anhydro-2,6-dideoxy-3,C-methyl,3,O-methyl-L-ribo-hex-1-enitol (2,2), and 3-acetamido-4, 6-di-O -acetyl -1, 5-anhedro-

TL;DR: In this paper, two water-soluble arabinan fractions have been isolated from the inner bark of Rosa glauca stems, and the results obtained by chemical N.M.R. 13 C-N.R.-spectroscopic methods were in good agreement.

TL;DR: In this paper, the cell walls of Schizosaccharomyces pombe with dilute alkali at 4° yields a mixture of polysaccharides including galactomannan, β-d-glucan, and a branched (1→3)-β-d -glucans.

TL;DR: In this paper, the key intermediates, methyl alpha-L- and alpha-D-glucopyranosides, were obtained in seven steps from the ester without change of configuration of the asymmetric center, which became C-5 in the sugar molecule.

TL;DR: The bacterium Klebsiella aerogenes type 25 produces an extracellular alginolyase which has been partly purified, which is specific for the α- l -guluronosyl linkages in whole alginate and fractions therefrom.

TL;DR: In this article, the influence of water concentration on the rates and yields in the dehydration of d -fructose to 5-hydroxymethyl-2-furaldehyde (HMF) and in the rehydration of HMF to levulinic and formic acids at 95° has been studied by the addition of polyethylene glycol-600 (PG-600) to the reaction mixtures.

TL;DR: In this article, the separation of the 2,3,4- from the 2.6-tri-O -methyl derivative of d -glucose was achieved for the first time.

TL;DR: It is demonstrated that the Shigella flexneri O-antigen is composed of repeating units having the following structure: →3)-β- d -GlcNA cp -(1→2)-α- l -Rha p -(2→1)- α- l-Rhap -( 1→3)

TL;DR: Observations indicate that the C1 component from Fusarium solani cellulase is a cellobiohydrolase, and the rate of change of degree of polymerisation of H3PO4-swollen cellulose was very slow compared with that effected by the randomly acting endoglucanases (Cx, CM-cellulases).

TL;DR: Controlled, partial benzylation of allyl 2-acetamido-3-O-benzyl-2-deoxy-alpha-D-glucopyranoside gave a mixture of the 3,4-di-, 3,6-di- (15), and3,4, 6-tri-O (15) derivatives, the major product being 15.

TL;DR: In this paper, 1,6-Anhydro-3,4-dideoxy-β-D - glycero -hex-3-enopyranos-2-ulose (levoglucosenone) was prepared on a laboratory scale by pyrolysis of H 3 PO 4 -treated, Kraft waste-paper.

TL;DR: Fragmentation of the neuraminic acid derivatives in electron-impact mass spectrometry has been studied by deuterium labelling and the results were applied in the methylation analysis of neuraminics acids from gangliosides of brain and kidney.

TL;DR: In this paper, the 13 C-n.m.r. spectra of cellulose ethers (methyl, carboxymethyl, and hydroxyethyl) have been examined at 22.6 MHz.

TL;DR: In this article, a simple kinetic model has been developed to relate kinetic data of previous publications about the isomerization of dglucose into d-fructose in aqueous, alkaline media in the temperature range 22-71°, which allows transformation of the rate constants published.

TL;DR: In this article, the 2,3:4,6-di-O-isopropylidene-α-d -mannopyranoside (α-D-mannofuranoside) was shown to react with 2,2-dimethoxypropane in 90% yield.

TL;DR: In this paper, the same arrangement of O -methyl and O -acetyl groups has been observed to yield markedly different chemical-ionization (c.i.i.) mass spectra.

TL;DR: In this article, the product distribution (determined by isotachophoresis and ion-exchange chromatography) was determined at pH 8-11 and 45-65.