Showing papers in "Carbohydrate Research in 1973"

TL;DR: Pyrolysis of cellulose under vacuum and atmospheric pressure gave a tar that had no reducing end-group, was randomly linked, contained some furanoid rings, and was very similar to the polysaccharide condensation-product of 1,6-anhydro-β-D-glucose.

TL;DR: In this article, it was found that the relative extension of the three types of blocks in alginate increased in the order "MG-blocks" M aqueous sodium chloride and in the unperturbed state.

TL;DR: In this paper, the synthesis of complex glycosides (the α anomers of which are of special interest) was demonstrated by the preparation of cholestanyl and 1-naphthyl α-D -glucopyranoside and a disaccharide derivative.

TL;DR: In this paper, the authors reported the crystallographic and stoichiometric data obtained for 17 different inclusion complexes of α-cyclodextrin and found that the cell dimensions and space-group symmetries reflect the packing arrangement of the torus-shaped host molecules and are largely determined by the size and ionic character of the guest molecules.

TL;DR: In this paper, a method for the selective degradation of polysaccharides containing uronic acid residues is described, which involves methylation of hydroxyl and carboxyl groups, base-catalysed elimination, and mild hydrolysis with acid.

TL;DR: In this article, a depolymerization technique for structural characterization of glycosaminoglycans was proposed, based on deamination of 2-amino-2-deoxy-D-glucose hydrochloride.

TL;DR: The data obtained show that heparitin sulfate is not a single compound but constitutes a family of related polymers which differ in sulfate content and in the arrangement of charged groups.

TL;DR: In this article, the mass spectra of aldoses, deoxyaldoses, and ketoses containing 3-7 carbons were recorded on the ethers of the trimethylsilyl O-methyl oxime derivatives.

TL;DR: In this article, the major carbohydrate of low molecular weight in brown seaweeds named in the title, Mannitol, was detected in Bifurcaria, and glucose and myo-inositol were detected in Himanthalia.

TL;DR: A number of 1-thio-β-d -aldosides were prepared directly or indirectly from acetylated 1-halides of d -galactose, d -glucose, and 2-amino-2-deoxy- d-glucoses as discussed by the authors.

TL;DR: The chitosan products 3 and 4 showed marked in vitro growth inhibition of leukemia L-1210 cells and moderate blood-anticoagulant activity.

TL;DR: Eight alkyl oligo-β- D -glucosides having a terminal epoxide function have been synthesized and tested as active-site-directed, irreversible inhibitors for cellulases from an Oxyporus species, Aspergillus niger, and Asp.

TL;DR: In contrast to reactions with high concentration, reactions of several derivatives of 2,3,4-tri-0-benzyl-6-0-(N-phenylcarbamoyl)-α-D-glucopyranosyl bromide with low concentrations of methanol gave mainly the α- D -glucosides regardless of the structure of the C-6 substituent as mentioned in this paper.

TL;DR: In this paper, the degradation of a gel-forming D-glucan with formic acid was investigated in both neutral and alkaline solutions, and the results indicated that (1→3)-β-Dglucans of DP n below ca. 25 (the soluble D -glucus) took a disordered form, whereas the D -lucus of higher DP n (the insoluble and the original D -oglucans) took an ordered structure in dilute alkaline solution (0.1 M ).

TL;DR: In this article, the interaction of benzeneboronic acid, 4-methoxybenzenebronic acid and 3-nitro benzene-boronic acid with d -glucose, d -mannose, and d -fructose at various pH values has been investigated by means of optical rotation methods.

TL;DR: In this paper, a small excess of 2,2-dimethoxypropane in N,N -dimethylformamide solution in the presence of a trace of p -toluenesulfonic acid, 2-acetamido-2-deoxy- D -glucose, 2.2-methylmannose, D-glucoses, and D -mannose gave the known 2,3:5,6-di- O -isopropylidene-D -mannofuranose.

TL;DR: In this article, a review of single-crystal studies shows that α-Dglucopyranose residues of which constitute the monomeric units of amylose, is flexible within the constraints of the Cl conformation, and the internal differences among the rings are most clearly indicated by the variety in ring-torsion angles (or conformation angles).

TL;DR: Iodine-cyclohexa-amylose tetrahydrate (C6H10O5)6 ·I2·d4H2O] was solved by heavy-atom techniques and refined by least-squares methods to a conventional discrepancy index R  0.148 for the 2872 observed data as mentioned in this paper.

TL;DR: In this article, it was shown that the tritium isotope effect of intramolecular hydrogen transfer occurs, during the conversion from C-2 of D-glucose to the carbon atom corresponding to C-1.

TL;DR: In this article, an empirical measure of the molecular stiffness of the products, both before and after reduction with sodium borohydride, was obtained by studying the sensitivity of their intrinsic viscosities to changes in the ionic strength of the solution.

TL;DR: The oligosaccharides isolated from different tissues by the same method as that used for rat liver, were similar as judged by their migration in paper chromatography and by the pattern of products liberated by acetolysis.

TL;DR: Hammett relations are valid for α- D -glucosides and α-D -mannosides, and can be improved by considering inductive and mesomeric contributions of the substituents, and their relevance for the α - D -anomeric specificity, governed by a protein electrophile, is discussed.

TL;DR: It was concluded that the α-(1→4)- α-1→3)-, and α-( 1→2)- D -glucosidic linkages that occur in bacterial dextrans were resistant to the action of dextran-glucOSidase, and arrested the further enzymic degradation ofdextran.

TL;DR: In this article, three-dimensional X-ray diffraction data were used to determine the crystal structure of α,α-trehalose-calcium bromide monohydrate, a model system for investigation of factors involved in the binding of calcium ions to d -glucans of dental plaques.

TL;DR: In this article, it was shown that arabinofuranose side-groups can be incorporated into the ordered assembly and contribute to the optical rotation shift, and they therefore have an unusual role compared with other polysaccharide side-chains.

TL;DR: Methylation gave identical patterns of methylated sugar components, from which the following structural elements were deduced: chain residues of ( 1→3)-linked d-glucose substituted at positions 4 and 6 by pyruvate, and (1→4)- linked d- glucuronic acid.

TL;DR: In this article, aqueous alkaline hydrogen peroxide solutions at 0° degrade aldohexoses almost quantitatively to 6 moles of formic acid, and aldopentoses to 5 moles.