Showing papers in "Carbohydrate Research in 1978"

TL;DR: Capillary g.l.c. on SE-30 of trimethylsilylated (-)-2-butyl glycosides of d and l monosaccharides gives multiple peak patterns, which can be used for the assignment of the absolute configurations as mentioned in this paper.

TL;DR: In this article, it was shown that the primary mechanism of interchain association is by dimerisation of poly-L -guluronate chain segments in a regular, buckled, two-fold conformation related to that characterized for the free acid in the solid state, with tight interchain chelation of calcium to the carboxylate groups on the interior faces of the dimer.

TL;DR: The crystal structure of A-amylose is based on parallel-stranded, right-handed double helices as mentioned in this paper, which results in nearly hexagonal close-packing, and the similarities in packing suggest that interconversions of A and B are possible.

TL;DR: Two major forms of branching enzyme from developing kernels of maize have been detected after DEAE-cellulose chromatography, and combined action of the branching enzymes and rabbit-muscle phosphorylase a resulted in similar patterns of incorporation of d-glucose into the growing α- d -glucan and the synthesis of high molecular-weight polymers.

TL;DR: It is proposed that the acceptor reaction proceeds by nucleophilic displacement of glucosyl and dextranosyl groups from a covalent enzyme-complex by a specific, acceptor hydroxyl group, and that this reaction effects a glycosidic linkage between the D-glucosyl

TL;DR: In this article, the sedimentation coefficient of xanthan was measured by band-sedimentation of polysaccharide molecules that had been tagged with a fluorescent group; the fluorescent label permits the use of very low concentrations of polymer.

TL;DR: In this article, the i.r. spectra for aqueous solutions of sulfated glycosaminoglycans and model compounds in the transmittance window region of the solvent (1400-950 cm −1 ) are dominated by the strong and complex absorption centered at ∼1230 cm − 1 and associated with the antisymmetric stretching vibrations of the SO groups.

TL;DR: In this article, the synthesis of 2-azido-2-deoxy- D -gluco- and -D -galactopyranosyl halides is described.

TL;DR: Enzymic degradation of various samples of algal alginate to leave the poly-M blocks intact has shown that these blocks have a uniform chain-length, estimated at 24 residues.

TL;DR: In this paper, a modified (2, O-2-hydroxypropyl distarch phosphate) manioc starch was hydrolyzed with pullulanase, beta-amylase, and/or amyloglucosidase and the hydrolyzates fractionated on Sephadex G-50.

TL;DR: In this paper, the selective halogenation of hydroxymethyl groups in sugars and nucleosides has been achieved by use of triphenylphosphine and carbon tetrahalides (chloride, bromide, or iodide) in pyridine.

TL;DR: Bacillus macerans cycloamylose (cyclodextrin) glucanotransferase (EC 2.4.1.19) was purified by the technique of starch adsorption and DEAE-cellulose column chromatography, and then crystallized from an ammonium sulfate solution containing mM calcium chloride.

TL;DR: In this article, two D-glucosyltransferases (GTF-S and GTF-I) were used to synthesize a soluble (1→6)-α-D -glucan from culture filtrates of S. mutans OMZ176.

TL;DR: In this paper, the polarity of the sulfur atom and certain proton and carbon chemical-shifts in the 1-thioglycosides in comparison with the O-glycosyl analogs were established; these correlations permitted the unambigous attribution of anomeric configuration.

TL;DR: In this paper, the authors studied the carbohydrate-binding specificity of Bandeiraea simplicifolia lectin II (BS II lectin) by quantitative precipitin and hapten-inhibition analysis.

TL;DR: Barley endosperm cell-walls were prepared and analyzed as mentioned in this paper, showing that mixed-linkage β- d -glucan represented 70-72% of the wall material.

TL;DR: P -Nitrophenyl maltotrioside and maltotetraoside were shown to be the higher homologues of klebsiella pneumoniae transferase and are very good substrates for human and pig-pancreatic alpha amylase.

TL;DR: By using the techniques of methylation analysis, uronic acid degradation, partial hydrolysis, and periodate oxidation, th structure of the capsular polysaccharide from Klebsiella serotype K70 has been investigated and the existence of a linear, hexasaccharide repeating unit having a 1-carboxyethylidene group attached to a 2-linked alpha-Rhamnosyl residue in every second repeating unit has been demonstrated.

TL;DR: In this paper, the authors used the fluorescence probe pyrene within the void of cycloheptaamylose to study the reaction of excited states of the arene with quencher molecules and showed that the rates of quenching of the excited states by such molecules as I -and CH 3 NO 2 are significantly decreased by inclusion in the dextrin.

TL;DR: In this paper, the influence of pH, temperature, ionic strength, and some additives on the c.d. spectra of aqueous solutions of pectins of various degrees of esterification has been studied.

TL;DR: The reaction of an aldose derivative containing a free anomeric hydroxyl group with trifluoromethanesulfonic anhydride, in the presence of halide ion and s-collidine, furnishes a glycosyl halide; if an alcohol is then introduced, glycoside synthesis is effected in an overall, one-pot reaction.

TL;DR: In this article, a new enone was identified by preparative column chromatography in 1.4% yield and identified as 1,5-anhydro-4-deoxy-d - glycero -hex-l-en-3-ulose.

TL;DR: In this article, three serologically related, title strains produced extracellular polysaccharides that were mixtures of an acidic polysacchide and smaller proportions of a glucan.