The isolation and characterization of a water extract of konjac flour gum

Norway spruce galactoglucomannans exhibiting immunomodulating and radical-scavenging activities

“…However, the de-acetylated sample was no longer completely soluble in water at ambient temperature, and the M app of its soluble part was about 10 kDa. Similarly, as in the case of other polysaccharides subjected to de-acetylation, such as the xyloglucan from suspension-cultured Nicotiana plumbaginifolia cells [32] and acetylated konjac glucomannan [33], the removal of the acetyl groups from AcGGM favors intermolecular chain interactions leading to the formation of hydrogen-bonded systems, which could resist during re-solubilisation of the once dried GGM. Screening of the immunostimulatory activity of both preparations AcGGM and GGM was performed in vitro by the LTT test, originally elaborated for the testing muramyl glycopeptides [28].…”

Rheological and microstructural investigation of oat β-glucan isolates varying in molecular weight

“…Previous studies indicated that polymer solutions follow the Cox-Merz rule at low concentrations but deviations occur at high concentrations whereby Á* was higher than Á at high frequencies or shear rates [7,12,14,43,44,46]. At concentrations up to 1% (w/v), OBG followed the Cox-Merz relationship as there were no significant differences between Á* and Á at equivalent rates of deformation, whereas OBG dispersions >1% showed deviations from the rule (i.e., Á* > Á) at high shear rates with an increasing difference as the concentration increased.…”

Preparation of mid-to-high molecular weight konjac glucomannan (MHKGM) using controllable enzyme-catalyzed degradation and investigation of MHKGM properties

“…In addition, its high viscosity, excellent film-forming ability, and good biocompatibility, biodegradability, as well as gel-forming properties entitle KGM to be a novel natural polymer material, which has been used in various fields such as food additives, pharmaceuticals, biotechnology, and the fine chemical industry [5][6][7][8]. The intrinsic viscosity of native KGM was found to be 1320 mL/g, among the highest of the polysaccharides [9]. The solubility of KGM in water is very poor even though it is a hydrophilic molecule; this feature has been markedly limited the applications of KGM [10,11].…”

“…There were two key problems, namely how to make the MHKGM degradation products from native KGM using controllable enzyme catalysis and how to purify the MHKGM from solution form into powder form. Among the existing techniques used to decrease the KGM molecular weight, acid, alkaline, and enzyme hydrolyses are the most common [5,7,9]. Almost all of these methods for KGM degradation must be carried out in water, so the reaction produces MHKGMs in solution.…”

“…MHKGM with different molecular weight shows various physicochemical properties and physiological function [4,9]. Furthermore, MHKGM is remarkably more soluble than native KGM in water [5].…”