Showing papers in "Carbohydrate Polymers in 1996"

TL;DR: The bacterial cell envelope - a historical perspective, M.R. Matsuhashi molecular biology of bacterial septation, J.J. Maidhof biosynthesis of the bacterial peptidoglycan unit, and structure-function relationships in porins as derived from a 1.8 Angstrom resolution crystal structure.

TL;DR: Chitosan exhibits anticholesterolemic, antiulcer and antiuricemic properties when orally administered, and is potentially suitable for the prevention of the coeliac disease and susceptibility to the hydrolytic action of lipases is discussed.

TL;DR: In this article, the effect of molecular weight of chitosan on the above thermal, mechanical, and permeation properties, respectively of the prepared membranes was investigated. But the results showed that the membrane prepared from high molecular weight chitus were higher than those from low molecular weight.

TL;DR: In this article, six hemicellulosic fractions were extracted successively from dewaxed wheat straw with sodium hydroxide at increasing strength from 0.25 to 2.00M, and the chemical composition were reported.

TL;DR: The data suggests that tailor-made chitosans with a predetermined degradation rate in the human body can be made by simply controlling their FA-values, and that short-range interactions rather than long-range electrostatic interactions between the positively charged lysozyme and the negatively charged chitOSan substrate are of importance for determining substrate specificities.

TL;DR: In this paper, the physical properties of edible films, based on blends of sodium caseinate with starches of different origin (corn and wheat) plasticized with water, glycerol or sugars, were studied.

TL;DR: In this article, the authors investigated the impact strength and tear resistance of PVA-cast films with different types of starch types: normal cornstarch, waxy starch, high amylose starch, wheat starch, potato starch, and tapioca starch.

TL;DR: In this article, the influence of crystallization on the stress-strain behavior of thermoplastic potato starch has been monitored and a rapid increase in B-type crystallinity and a change in mechanical properties was observed within 2 weeks at 70 and 90% relative humidities.

TL;DR: In contrast to previous work on the screening of chitosan from fungal sources, the mycelia of the fungi used in this study were harvested at their late exponential growth phase instead of at a fixed incubation time, and the amount of extractable chitOSan varied widely among the fungal strains.

TL;DR: When fully deacetylated chitosan is contacted in solution with chondroitin sulfates and hyaluronic acid, pure polyelectrolyte complexes are formed as mentioned in this paper.

TL;DR: In this paper, the rheological and thermal properties of gellan gum solutions with and without sodium chloride, potassium chloride, calcium chloride and magnesium chloride were studied by dynamic viscoelastic measurement and differential scanning calorimetry.

TL;DR: In this article, commercial chitosans prepared by heterogeneous alkaline deacetylation with different FA values were fractionated into acid-soluble and acid-insoluble fractions.

TL;DR: In this paper, a scale of selectivity for the binding of calcium and some heavy metal ions by citrus and sugar-beet pectins was set up by pH-measurements.

TL;DR: In this paper, it was shown that the double helix structures of both welan and rhamsan are perfect double helices, with exact pairing of strands along the full length of the participating chains.

TL;DR: In this paper, aqueous blends of microcrystalline cellulose (MCC) or methyl cellulose and corn starch with or without polyols were extruded, hot pressed and studied, after their conditioning at different relative humidities, in terms of their thermal, mechanical and water and gas permeability properties.

TL;DR: In this paper, the influence of divalent (Ca 2+ and Mg 2+ ) and monovalent (Na + and K + ) cations on the failure stresses and strains in gels formed with gellan polymer were investigated.

TL;DR: In this article, polysaccharide extracts were prepared from two traditional food thickeners with extensive domestic use in central and western parts of Africa: okra (Hibiscus esculentis L.) and the seed kernel from ‘dika nut’ (Irvingia gabonensis).

TL;DR: Starch acetates having degrees of substitution (DS) 1.5, 2.0 and 2.5 were prepared by the reaction of high-amylose cornstarch with acetic anhydride and aqueous sodium hydroxide as discussed by the authors.

TL;DR: In this paper, two chitosan samples (fraction of acetylated units (FA) 0.15 and 0.52) were fractionated by preparative size exclusion chromatography (SEC).

TL;DR: In this article, small deformation oscillatory measurements have been used to characterise the effect of ordered xanthan on the rheological properties of gelatinized waxy maize starch (crosslinked and uncrosslinked).

TL;DR: The hairy regions of highest molecular weight (PVa) with 1,3,6 linked galactose side chains were found to be the most active fraction, and the importance of arabinose for the activity seems to depend on the site of substitution.

TL;DR: In this article, carboxymethylated β-cyclodextrin and partially deacetylated chitin (Mw = 7300) were shown to have the ability to form an inclusion complex.

TL;DR: In this article, the pasting properties of four wheat varieties (Egret and Rosella, soft grain; Vasco and Halberd, hard grain) were characterized and the relationships between pasting and molecular properties were analyzed.

TL;DR: The synthesis of a novel polycationic polysaccharide derivative having recognizable saccharide residues, N,N,N-trimethyl(TM)-chitosan/galactose conjugate was performed to achieve an efficient gene delivery via receptor-mediated endocytosis.

TL;DR: Water-soluble methylcellulose (MC) samples were synthesized by a new homogeneous reaction using DMAc/LiCl as solvent, a dimsyl sodium solution as activator and CH3 as alkylating reagent.

TL;DR: In this article, the profiles and positions of the GPC curves are progressively altered during the course of the papain-promoted hydrolysis of chitosan, and the results show that the most depolymerized fractions having the highest degrees of polymerization are depolymersized and Mw, [η] and RG values are lowered.

TL;DR: In this article, a commercial apple pectin sample was partially saponified to give three different DM pectins of E. carotovora and the sizes of the resulting fragments were determined by HPLC.

TL;DR: In this paper, a correlation was observed between the swelling behavior in this buffer and the equilibrium properties of alginic acid gels, and it was shown that high contents of long l -guluronic acid blocks, known to give a high acid gel strength, reduced the rate of swelling and also the amount of solubilized alginate molecules leaching out of the gel beads.

TL;DR: In this paper, the potential of vibrational spectroscopy and chemometrics as a reliable and fast method for the determination of important gel-forming parameters in amidated pectins has been investigated.

TL;DR: In this paper, the temperature-dependent rheology of more concentrated systems in mixed and pure solutions of the same salts was studied and two types of kappa-carrageenan gels were distinguished, depending on the cesium content.