Showing papers in "Carbohydrate Research in 2007"

TL;DR: The results showed that quaternized chitosan had better inhibitory properties than ch itosan, Schiff bases of chitOSan, and N-substituted chITosan.

TL;DR: The essential role of protein-glycosaminoglycan interactions in the regulation of various physiological processes has been recognized for several decades but it is only recently that the molecular basis underlying such interactions has emerged.

TL;DR: Results show that semi-IPN hydrogel seems to be of great promise in pH-temperature oral drug delivery systems.

TL;DR: The results reveal that cellulose is dissolved completely and that cellulOSE I (cotton linter) first changes to amorphous cellulose chains in solution, and then to cellulose II during regeneration, as confirmed by dynamic rheology measurements.

TL;DR: The discovery of new methods for stereoselective glycoside synthesis and convergent oligosaccharide assembly has been critical for the area of glycosciences and the current standing in the field is evaluated.

TL;DR: Alginate fractions from S. vulgare brown seaweed were characterized by (1)H NMR and fluorescence spectroscopy and by rheological measurements and are much richer in mannuronic block structures than those from other Sargassum species.

TL;DR: It was found that B. subtilis produced sufficient quantities of acid to remove the minerals from the shell and to prevent spoilage organisms and the protease enzyme in Bacillus species was responsible for the deprotenisation of the shell.

TL;DR: The technology presented here opens the way for tailoring polyvalent anticancer vaccines candidates and drug delivery carriers with defined average chemical composition.

TL;DR: It was found that the crystallinity of the cellulose was completely disrupted in the ionic liquid system under the conditions given and demonstrated that homogeneous modification of cellulose with succinic anhydride in AmimCl resulted in the production of cellulosic monoester.

TL;DR: An NMR spectroscopy study of the postulated crosslinking mechanism of sodium trimetaphosphate on polysaccharides is reported using methyl alpha-D-glucopyranoside as a model to detect the various species formed and to obtain the crossl linking density of STMP-polysaccharide hydrogels.

TL;DR: This review is aimed at highlighting the synthetic aspects of salacinol and related compounds as well as their structure-activity relationship studies.

TL;DR: The metal uptake mechanism for both polymers is concluded to be absorption within the polymers, rather than adsorption on the polymer surface.

TL;DR: By combining the two methods, a complete quantification of all individual types of uronic acids present in a sample can be achieved.

TL;DR: This approach not only provides a powerful methodology to produce polysaccharides with defined structures and morphologies as novel biomaterials, but is also a valuable tool to analyze the mechanisms of polymerization and packing to acquire high-order molecular assemblies.

TL;DR: This technique was used to characterize structurally different isomeric AX oligosaccharides produced by endoxylanase enzymes with different substrate specificities, including Araf substitution patterns along the xylan backbone and comprehensive linkage assignment.

TL;DR: A polysaccharide fraction consisting of d-galactose, sulfate, and pyruvate in a molar proportion of 4:2:1 was isolated from the green seaweed Codium yezoense by water extraction followed by ion-exchange chromatography to elucidate its structure.

TL;DR: The fractional release of cent chroman (M(t)/M(infinity)) from chitosan microspheres was used to predict the mechanism of drug release and to determine the diffusion constant (D) of centchroman.

TL;DR: Results indicated that CBCS could be a potential pH-sensitive carrier for colon-specific drug delivery system and showed swelling reversibility when alternately soaked in pH1.0 and 7.4 buffer solutions.

TL;DR: (1-->3)-Glucosylation is special since the rearrangement of its sugar orthoester intermediates can occur with either RO-(orthoester)C bond cleavage with formation of the dioxolenium ion leading to 1,2-trans linkage, or C-1-O-1 bond Cleavage leading to 2-cis linkage, and this is dependent upon the structures of donor and acceptor that compose the Orthoester.

TL;DR: The results show that the hydrolysis of the tetramers is a nonrandom process as the glycosidic bonds next to one of the end residues are hydrolysed 2.5 and 2.0 times faster as compared to the other gly cosidic linkages in the fully N-acetylated and partially N-deacetylation tetramer, respectively.

TL;DR: The data reveal that SCG but not SPG induce cytokine production from bone marrow-derived dendritic cells (BMDCs) and their major structural units are a beta-1-->3)-d-glucan backbone with single beta-(1-->6)-d -glucosyl side branching units every three residues.

TL;DR: The supramolecular assembly between chlorhexidine and cyclomaltoheptaose (beta-cyclodextrin, betaCD) was characterized using NMR spectroscopy and showed that the assembly is strongly stabilized by short distance interactions, but suffers a strong, opposite effect of entropy reduction.

TL;DR: Investigation of the acid hydrolysis of two common anhydro sugars in wood pyrolysis oils found that levoglucosan and cellobiosan are hydrolyzed to glucose, which is a first-order reaction.

TL;DR: Pepsin produced a higher yield of chitosan oligosaccharides than the other enzymes and the calculated average polymerization degree of the products released by pepsin was around 16 units after 20h of hydrolysis, and this product pattern and yield are proposed to be related to the bond cleavage specificity of pepin and the high deacetylation degree of ch itosan used as substrate.

TL;DR: It was found that the moisture content of the air-dry chitosan samples can be as high as 15%, and a reasonable fraction of this humidity cannot be removed by ordinary drying, and thus potentiometry is hardly able to compete with other standard spectroscopic procedures, that is, (1)H NMR spectroscopy.

TL;DR: Good agreement is found with available experimental and theoretical data on the structural, dynamical, solvation and energetic properties of these compounds, but this detailed comparison also reveals some discrepancies, suggesting the need for further refinement.

TL;DR: The structure-activity relationships (SAR) between the polysaccharides and their sulfated derivatives showed that the higher the DS is, the more potent the impact on the dengue virus infection would be.

TL;DR: A review of the primary structures (known to date) of natural phosphoglycans from various sources, which contain glycosyl phosphate units, and different approaches and recent achievements in the synthesis of gly cosyl phosphosaccharides and poly(glycosyl phosphates) are presented.

TL;DR: A structural investigation of PIP60-1 carried out using sugar and methylation analyses, combined with (1)H and (13)C NMR spectroscopy, established the repeating unit of the polysaccharide as the following.

TL;DR: The available evidence suggests that the macrophage-stimulating activity of glycogen is strictly related to its molecular weight rather than to any fine structural property, and there is minor correlation between active and less-active glycogen derivatives.