Showing papers in "Carbohydrate Research in 1969"

TL;DR: In this article, a simple procedure for quantitative, colorimetric determination of periodate at the nanomolar level was proposed, based on a study of the course of oxidation of 1-to 2-μmolar samples of several representative carbohydrates.

TL;DR: In this article, a comparative study of the rates of enolization of sugars in alkaline, tritiated water was made by measurement of their rates of tritium uptake; the rates for two inososes were found to be more than 1000 times the rate for D -glucose.

TL;DR: The peracetylated diethyl dithioacetals of d -ribose, d -arabinose and d -xylose were studied in chloroform-d solution by nmr spectroscopy at 100 MHz.

TL;DR: In this paper, a disaccharide mixture is reduced to the corresponding alditols, and analyzed as the O-trimethylsilyl derivatives by g.l.c.

TL;DR: The glycosylating activity of 2-methyl-glyco[1′,2′:4,5]- 2-oxazolines has been investigated in connection with the synthesis of 1,2- trans -2-acetamido-2-deoxy-glycosides.

TL;DR: The n.m. spectra of sucrose octaacetate, 1-kestose hendecaacetane (2), and nystose tetradecaacetate (3) were measured in benzene-d6, chloroform-d, and acetone-d 6, at 100 and 220 MHz as mentioned in this paper.

TL;DR: In this article, it was shown that the forbidden linkages and their locations in the donating molecule support the hypothesis that D-enzyme appears to operate on maltodextrins under constraint, and that the transfer rate of the maltosyl group to d-glucose is equal in malto-triose, -pentaose, and -hexaose.

TL;DR: Quantitative studies reveal that the alpha-amylase-catalyzed cleavage of the α- d -(1→4) bonds in starch proceeds with retention of configuration, and a reaction mechanism involving general acid-catalysis by imidazole, and ring distortion to produce an oxycarbonium-ion intermediate, is proposed.

TL;DR: In this paper, a benzoylation of benzyl 4,6- O -benzylidene-β- d -galactopyranoside with one equivalent of benzoyl chloride in pyridine-dichloromethane solution yields preferentially the 3-benzoate 3.

TL;DR: In this article, the 1C (d)-Ribopyranose tetraacetate was shown to exist, in acetone-d 6 at room temperature, as a 9:11 mixture of 1C(d) and C1(d ) conformers in rapid equilibrium.

TL;DR: In this paper, a method involving chromatography on DEAE-cellulose and gel-filtration on Sephadex G-50 was described for purification of the l -arabinan from a crude beet arabinan preparation.

TL;DR: D -mannans of Saccharomyces lodderi, Citeromyces matritensis, and Pichia pastoris could be enzymically degraded to polysaccharides containing predominantly α-(1→6)-linked D -mannopyranosyl residues after hydrolysis of most of the β- D -linked residues in their side chains with acid.

TL;DR: In this paper, the N-(trifluoroacetyl)ation of 2-amino-2-deoxy-D-glucose, followed by O-acetylation, gave the anomeric 1,3,4,6-tetra-O-acetyyl-2.2.

TL;DR: In this paper, the anomeric configuration of sugars released during enzymic hydrolysis of some d -glucosides and d-glucans in deuterium oxide has been determined by proton magnetic resonance spectroscopy.

TL;DR: In this article, a water-insoluble derivative of β-amylase by coupling with a 2-hydroxy-3-(p -isothiocyanatophenoxy)propyl ether of cellulose is described.

TL;DR: Evidence from this laboratory suggests that the interaction of concanavalin A with reactive polysaccharides occurs at the same binding sites of the protein, reaction with levans may be rationalized on the basis of common configurational features.

TL;DR: Combined gas-liquid chromatography-mass spectrometry (GC-MS) has been used for the analysis of 2-amino-2-deoxy- d -glucose, 2-amide-2.deoxy d -galactose, their corresponding alditols, as well as of the N -acetylated forms as mentioned in this paper.

TL;DR: Haworth, Kuhn, or Hakomori as discussed by the authors showed that partial methylation of methyl α- d -mannopyranoside by either Haworth and Kuhn gave the same methyl ethers but the degree of substitution at each position differed markedly.

TL;DR: In this article, the main properties of partially methylated methyl glucosides were derived from the fragmentation scheme of permethylated pyranoses by a consideration of the effects of the different substituents.

TL;DR: In this paper, the main properties of partially methylated methyl glucosides were derived from the fragmentation scheme of permethylated pyranoses by a consideration of the effects of the different substituents.

TL;DR: In this paper, the crystalline barium acid salt of heparin was oxidized with periodate, whereby its d -glucuronic acid residues were destroyed, and the oxidized material was reduced with borohydride; the product was treated with acid, and then deaminated with nitrous acid.

TL;DR: The fruit bodies of the fungi Polyporus fomentarius and polyporus igniarius have been examined for polysaccharide content as discussed by the authors, and they both contain a mannofucogalactan and a glucuronoglucan.

TL;DR: In this paper, the tricyclic ortho-ester β-L -arabinofuranose 1,2,5-ortho-benzoate was applied to the synthesis of polysaccharides.

TL;DR: The structures of compounds 4, 6, 7, and 9 were confirmed by p.m.r. spectroscopy and by their reactivity towards thiosulphate and iodide ions as discussed by the authors.

TL;DR: The gum exudate (brea gum) from the leguminous tree Cercidium australe contains residues of l -arabinose, d -xylose and d -glucuronic acid, in the approximate molar ratios of 1,7:6,3:1,9:0,9 as discussed by the authors.