Showing papers in "Carbohydrate Research in 1981"

TL;DR: The multi-branched nature of amylose samples from several plant sources was revealed quantitatively by these methods, and the concurrent action of Aerobacter pullulanase and sweet-potato beta-amylase hydrolysed the amylOSE completely.

TL;DR: The sequence of monomer units, l -guluronate and d -mannuronate, markedly influenced the chemical shifts and the relative occurrence of G-centred triads deviated significantly from those predicted by first-order Markovian statistics.

TL;DR: End-group analysis by using radioisotope-labeled glucans suggests that ultrasonic degradation occurs mainly by cleavage of glycosidic bonds of the main chain of schizophyllan, and there is no anomalous linkage sensitive to periodate oxidation.

TL;DR: The crystal structure of V h -amylose has been refined by a combined analysis of stereochemical conformation and packing, and by analysis of X-ray fiber diagrams as discussed by the authors.

TL;DR: An improved glycosyl-sequencing method has been used for elucidating the structure of the acidic polysaccharide secreted by Rhizobium meliloti strain 1021.

TL;DR: In this article, the ratio of A and B chains in a partially branched amylopectin has been determined, and the results are discussed in relation to possible structures for amylopsectin.

TL;DR: In this paper, the authors compared the antitumor activity of two (1 goes to 3)-beta-D-glucans, isolated from the fruiting body of Auricularia auricula-judae ("kikurage", an edible mushroom), and other branched polysaccharides containing a backbone chain of ( 1 goes to 2)-alpha-Dglucosidic or (1 go to 3]-alpha-d-mannosidIC linkage.

TL;DR: The limiting viscosity numbers calculated for the “mannan backbones” of α- D -galactosidase-treated, guar galactomannan having galactose-mannose ratios of 38:62 to 15:85 were the same.

TL;DR: In this paper, El Khadem et al. investigated the reaction of d-glucose with benzoylhydrazine to give the bishydrazone of 3-deoxy-d-erythro -hexos-2-ulose.

TL;DR: In this paper, the molar ratios of complexed to uncomplexed polyhydroxy compounds, which give an indication of the relative stabilities of the complexes, are calculated from the chromatographic migration rates.

TL;DR: The structure of the hydrated amylose-iodine complex has been determined by combined methods of X-ray diffraction and stereochemical packing analysis as discussed by the authors, and the unit cell was identified as orthorhombic with a

TL;DR: Counter-current immunoelectrophoresis shows that esterification of approximately 9% is sufficient to abolish immunoprecipitation, and spectroscopy of fully esterified colominic acid provides strong evidence for cross-linking between the carboxyl group of one residue and HO-9 of an adjoining residue.

TL;DR: The enzyme, tentatively termed 6G-fructosyltransferase, was homogeneous in disc electrophoresis, was stable at pH 5.0–6.0 on heating for 20 mins at 45° and for 10 min at 20–37°, and was inhibited by Hg2+, p-chloromercuribenzoate, and Ag+.

TL;DR: In this paper, a wide range of molecular sizes was revealed by chromatography of the methylated mucilage on Sephadex LH-60, and the resulting 12 fractions were homologous.

TL;DR: The synthesis of a branching hexasaccharide unit, methyl 3- O -(2-acetamido-2-deoxy-β- d -glucopyranosyl)-α-d -mannopyrnosyl, is described, a core structure of the complex type of glycans of glycoproteins is described.

TL;DR: In this article, the chloroazide was added to 3,4,6-tri- O -acetyl-1,5-anhydro-2-deoxy-d - lyxo and - d - arabino -hex-1-enitol under u.v. irradiation, yielding O -benzyl derivatives of 2-azido-2,deoxy d -galactose and -d -glucose, respectively.

TL;DR: The structure of the O-specific side-chains of the lipopolysaccharide from Escherichia coli O 55 has been investigated, methylation analysis, specific degradations, and n.r.m. spectroscopy being the principal methods used.

TL;DR: The fine structures of the d -galacto-d -mannans varied as a function of the cell type as mentioned in this paper, and the proportion of glycogen was not glycogen.

TL;DR: In this article, X-ray diffractograms of aqueous solutions of d -fructose, d -glucose, and sucrose, and of two amorphous "solid" forms of these carbohydrates are recorded in the angular range of O 2-16°.

TL;DR: A xylanase from a commercial Aspergillus niger pentoglycanase was purified to homogeneity by column chromatography on Ultrogel AcA 54, SP-Sephadex, SephadeX G-50, and SP-Octanex to achieve maximal activity.

TL;DR: In this article, the influence of several reaction variables has been studied, leading to an adsorption model in which both the negatively charged O-1 and the close contact of H-1 with the catalyst surface are considered to be driving forces for the transfer of hydride from C-1 of the sugar to the catalyst.