Showing papers in "Carbohydrate Research in 1999"

TL;DR: The composition, molecular weight, anticoagulant activity and nuclear magnetic resonance spectra of various low-molecular-weight fucans obtained by partial hydrolysis or radical depolymerization of a crude fucoidan extracted from the brown seaweed Ascophyllum nodosum are compared.

TL;DR: Other fucoidan fractions from C. filum have more complex carbohydrate composition and give rather complex methylation patterns, which correspond to a quasiregular polysaccharide structure with a branched hexasaccharide repeating unit.

TL;DR: The goal of this study was to characterize the similarities and differences in conformational and configurational behavior as well as in calcium binding in order to progress in the understanding of the physicochemical properties of the parent polysaccharides of industrial interest, namely pectin, alginate and glucuronan.

TL;DR: In this paper, a simple method for the separation and isolation of the water-soluble polysaccharides of brown algae (i.e., laminarans, fucoidans and alginates, respectively) based on hydrophobic chromatography has been developed.

TL;DR: In this paper, two dehydrodiferuloylated oligosaccharides (F8 and F9) were isolated from maize bran and their structure was determined using chromatography and LCMS and confirmed by 1H and 13C NMR spectroscopy.

TL;DR: In this article, a method was developed that enabled quantification of non-methyl-esterified Galacturonic acid (GalA) sequences in pectin using enzymes.

TL;DR: Chitosan of 24% degree of acetylation was depolymerized by a mixture of cellulase, alpha amylase, and proteinase to give the title oligosaccharides.

TL;DR: In this paper, the gelation rate of concentrated barley (1→3)(1→4)-β-glucan solutions was investigated via oscillatory time experiments, and it was deduced that sections of consecutive cellotriose units constituted the cross-links.

TL;DR: The primary structure of the new feruloyl arabinoxylopentasaccharide from wheat bran hydrolysis, which has been determined using 2D NMR spectroscopy, is O-beta-D-xylopyranosyl-(1-->4)-O-[5-O- (feruloyL)-alpha-L-arabinofuranosyl-[1-->3], which is closer to the former than the latter.

TL;DR: In this article, a commercial citrus pectin was analyzed using HPSEC with online light scattering and viscosity detection, and the results showed that the high-molar-mass fraction was extremely compact in shape, whereas the lowmolar mass fraction was more asymmetric in shape.

TL;DR: In this paper, several multivariate procedures, such as principal component analysis (PCA), trimmed object projections (TOP), canonical correlation analysis (CCA), and partial least squares regression (PLS), were applied to their FTIR spectra, in the region between 1200 and 850 cm−1.

TL;DR: The authors investigated the influence of reaction temperature, processing time, and mechanical shear on the depolymerization of chitosans and evaluated the importance of the sequencing of the deacetylation and DP processes on the resultant macromolecules and their properties.

TL;DR: This work has successfully developed a protocol to obtain a soluble Candida spp.

TL;DR: The 7-O-beta-D xyloside 6 was a stronger competitive inhibitor than 4 of C saccharolyticum beta-glucosidase and rat intestinal lactase, with K(i) values of 0.06 and 0.07 microM, respectively, but a weaker inhibitor of bovine liver beta-galactosidases.

TL;DR: An unusual heteroxylan composed of galactosyl, 4-O -methyl-glucuronosyl and xylosyl residues with molar ratio 1:3:30 was isolated from the wood of Eucalyptus globulus Labill as mentioned in this paper.

TL;DR: The reactions are highly efficient, giving α glycosides even with sterically demanding glycosyl acceptors, and could be achieved by simply changing the solvent from benzene to acetonitrile.

TL;DR: Best release properties and highest mechanical hardness were obtained from CLHAS matrices with low-to-moderate crystallinity, where the V- and the B-type structures coexist with amorphous regions.

TL;DR: In this article, a protein extract from digestive glands of the marine mollusc Pecten maximus was shown to possess fucoidan-degrading activity, which was able to release l -fucose from the brown algae Ascophyllum nodosum, and markedly reduce the molecular size of the polysaccharide.

TL;DR: In this article, the polysaccharide structure of alginic acid was examined as individual molecules and as dense gels using tapping-mode atomic force microscopy (AFM).

TL;DR: Dioscin, polyphyllin D, and balanitin 7, which belong to a group of structurally similar diosgenyl saponins with promising bioactivities, were synthesized by stepwise glycosylation.

TL;DR: A (1→3)(1→4)-β-d -glucan isolated from barley by a set of commercial β-glucans differing in molecular size was characterized by means of viscometry and size exclusion chromatography coupled with multi-angle laser light scattering as discussed by the authors.

TL;DR: The structure of the exopolysaccharide produced under laboratory conditions by Vibrio diabolicus, a bacterium recovered from a deep-sea hydrothermal vent, has been investigated using sugar and methylation analysis and NMR spectroscopy.

TL;DR: The ozonolysis method described herein provides a convenient, inexpensive, and controllable means for generating small polysaccharides or large oligosaccharide fragments.

TL;DR: The structure of the exopolysaccharide produced by Pseudoalteromonas reference strain HYD 721 recovered from a deep-sea hydrothermal vent has been investigated and was deduced to be a branched octasaccharide with the structure shown.

TL;DR: A large-scale production system of N-acetyllactosamine, a core structure of various oligosaccharides, was established by a whole-cell reaction through the combination of recombinant Escherichia coli strains and Corynebacterium ammoniagenes.

TL;DR: Results indicate that oxidative degradation of HA proceeds primarily at glucuronic acid residues, and meso-Tartaric acid may be a useful biomarker of hyaluronate oxidation since it is produced by both NaOCl and Fenton chemistry.

TL;DR: Six major saponins were isolated from a bark extract from Quillaja saponaria Molina using solid-phase extraction followed by a two-step reversed-phase HPLC separation procedure with phosphate and ammonium acetate buffers of different pH values.

TL;DR: A neutral polysaccharide was obtained by hot phenol-water extraction of biomass from Campylobacter jejuni 176.83 and subsequently separated from acid-liberated core oligosaccharide of lipopolysaccharides by sequential GPC on Bio-Gel P6 and TSK-40 columns.

TL;DR: A new polysaccharide composed of galactan sulfate with a β-(1→3)-glycosidic linkage has been isolated from the marine clam species Meretrix petechialis and the anti-HIV activity has been evaluated by the inhibition of syncytia formation.

TL;DR: In this paper, a monosubstituted amphiphilic cyclodextrins were incorporated into phospholipid bilayers using small-angle X-ray scattering, differential scanning calorimetry and 31 P nuclear magnetic resonance.