title: Viscoelastic properties of oat β-glucan-rich aqueous dispersions.
abstract: C-trim is a healthy food product containing soluble dietary fibre β-glucan. The dispersion of C-trim in water is a hydrocolloid biopolymer. The linear and non-linear rheological properties of dispersions of C-trim biopolymers were investigated. The linear viscoelastic behaviours for C-trim dispersions were dependent on the β-glucan that C-trim contained. The C-trim20 and C-trim30, which have about 20% and 30% β-glucan, respectively, exhibited more fluid-like behaviours. The C-trim50 and C-trim95, which contain about 50% and 95% β-glucan, respectively, showed solid viscoelastic properties. The power law model fitting, as well as spectra, for the linear dynamic frequency sweep and stress relaxation of C-trim dispersions, suggested that the C-trim dispersions were composed of physical entanglement networks instead of chemical cross ones. The non-linear steady shearing studies for C-trim dispersions indicated that all four of the C-trim dispersions exhibited shear-thinning behaviours, which could be best described by the power law model.
authors.affiliation: National Center for Agricultural Utilization Research, Agricultural Research Service, US Department of Agriculture, 1815 North University Street, Peoria, IL 61604, USA. james.xu@ars.usda.gov
authors.forename: Jingyuan
authors.initials: J
authors.lastname: Xu
authors.forename: George E
authors.initials: GE
authors.lastname: Inglett
authors.forename: Diejun
authors.initials: D
authors.lastname: Chen
authors.forename: Sean X
authors.initials: SX
authors.lastname: Liu
mesh_terms: D018554:Avena / Q000737:chemistry*; D003102:Colloids / Q000737:chemistry; D004548:Elasticity; D010936:Plant Extracts / Q000737:chemistry*; D014783:Viscosity; D047071:beta-Glucans / Q000737:chemistry*
chemical_list: D003102:Colloids; D010936:Plant Extracts; D047071:beta-Glucans