Showing papers in "Carbohydrate Polymers in 1984"

TL;DR: In this paper, single crystals of amylose with a low degree of polymerization were prepared from dilute solution in water or mixtures of water and ethanol, depending on the concentration of ethanol used, three different polymorphs resulted.

TL;DR: In this paper, the effects of polysaccharide structure and environment on the formation of fluorescent complexes between the polyscharide and a fluorochrome (4,4′ - [carbonylbis (benzene-4,1-diyl) bis(imino)] bisbenzenesulfonic acid (Sirofluor) isolated from the triarylmethane dye, aniline blue, have been studied.

TL;DR: In this article, the cell wall materials from apples with water, aqueous ammonium oxalate and dilute alkali yields polysaccharide preparations from which three components have been isolated on further fractionation in sufficiently homogeneous form for more detailed investigation.

TL;DR: A series of pullulan fractions with molecular weights in the range 5 × 103 to 8 × 105 were prepared and the weight-average molecular weight (Mw) of all the samples was determined by sedimentation equilibrium.

TL;DR: In this paper, two component polymers are extracted from the starch granules, namely amylose and amylopectin, based on chains on α-1,4-linked d-glucose.

TL;DR: The interaction of galactose-depleted guar galactomannan with agarose has been studied by optical rotation, and with xanthan using an Instron Materials Tester and a Rheometrics Mechanical Spectrometer as mentioned in this paper.

TL;DR: In this article, the authors used the racemose model for amylopectin and found that each raceme fit optimally the SANS scattering data when it was assumed to be either a squat cylinder or ellipsoid with dimensions of 150 × 60 A.

TL;DR: The block composition of alginate from a number of Phaeophyceae from Nova Scotia, Canada, has been determined by circular dichroism analysis by showing higher and lower levels of the structure-forming polyguluronate sequences than any previously reportedAlginate samples from mature plant tissue.

TL;DR: In this paper, a procedure to determine the absolute weight-average molecular weight (Mw) and molecular weight distribution (MWD) of guar by aqueous size exclusion chromatography coupled with low angle laser scattering is described.

TL;DR: In this article, wheat and potato starches were hydrolysed with 2·2 n hydrochloric acid at 35°C for a period of time up to 15 days.

TL;DR: In this paper, pectin molecules were extracted from lemon peel (albedo) and fractionated by ion exchange chromatography and gelfiltration and the distribution of the methoxyl groups was studied by HPLC analysis of enzyme-degraded pectins.

TL;DR: A new extracellular microbial polysaccharide, XM-6, has been isolated from cultures of an Enterobacter species and shows unusual gelation properties of potential technological significance as mentioned in this paper.

TL;DR: Ascorbic acid immediately dissolves Euphausia superba chitosan upon mixing and forms chitusan ascorbate; during the 6-h period after dissolution in water at pH 5-7, ascarbate is oxidized to dehydroascorbate which undergoes Schiff reaction with the amino groups of chitosa, thus yielding a viscous solution of a polymeric ketimine.

TL;DR: In this paper, the pectic macromolecules consist of long homogalacturonan regions (92% of total galacturonides) and of "hairy" regions in which neutral sugars form long or short side-chains.

TL;DR: In this article, the interaction between aniline blue and curdlan, a (1 → 3)-β-d -glucan, has been studied using absorption and fluorescence spectroscopy.

TL;DR: In this paper, the polyelectrolytic behavior of high-methoxyl pectins (degree of esterification = 72·9) was studied in the presence of sucrose.

TL;DR: In this article, the authors investigated the elastoviscous properties of some thermoreversible gels formed from anionic polysaccharides (high methoxyl pectin, furcellaran and κ-carrageenan) and also gelatin and maltodextrin.

TL;DR: In this article, significant changes in the structure of apple pectic substances were observed in senescent apples during ripening, and the degree of polymerization of both the galacturonan chains and the arabinogalactan side chains decreased.

TL;DR: The morphological features of amylose precipitates, especially the particle size and size distribution, during retrogradation have been investigated using scanning electron microscopy as mentioned in this paper, and it was found that the retrograded amyloses consisted of particles with a surprising uniformity in size, and the volume of each particle increased proportionally with the degree of retrogradation.

TL;DR: In this article, a wide range of concentrated random coil polysaccharide solutions have been assessed for textural attributes by a trained sensory panel, and the only textural terms invoked to describe these model systems were "thickness" and "stickiness" which were shown to be highly correlated, and essentially identical numerically, using a ratio scaling technique.

TL;DR: In this article, the solution properties of polycarboxylates obtained by periodate oxidation of scleroglucan, with different degrees of oxidation, have been studied as a function of pH.

TL;DR: In this article, the effect of the addition of a range of polysaccharides on the extrusion behavior of soya grits has been investigated and the alginate effect was investigated in detail and was observed both for moderate temperature and high temperature (∼180°C) extrusion.

TL;DR: The results suggest that tetanus toxin and sendai virus may have a large binding site which can accommodate at least four sugar residues and be correlated to their biological activity.

TL;DR: In this paper, the use of X-ray photoelectron spectroscopic techniques (XPS or ESCA) in the characterization of cellulose, starch and their oxidation products is discussed.

TL;DR: In this paper, the salicylate of chitosan was isolated with a 98% yeast yield, and salicylic acid was isolated from the dialysate (0·1 m NaOH solution) of N -(2′-acetoxybenzoyl)-chitosans.

TL;DR: A simple procedure for the hydrolysis of cellulose or biomass into cellodextrins using trifluoroacetic acid-water mixtures was found and it was found that maximum conversion of the cellulose into watersoluble oligomers was determined.

TL;DR: In this article, the reactions of potato starch in aqueous suspension with some isocyanates were investigated and it was found that no starch carbamates were formed but only the corresponding urea compounds.