|Tseng, Yiider - JOHNS HOPKINS UNIVERSITY|
|Wirtz, Denis - JOHNS HOPKINS UNIVERSITY|
Submitted to: International Congress on Rheology
Publication Type: Abstract Only
Publication Acceptance Date: August 27, 2004
Publication Date: August 27, 2004
Citation: Xu, J., Tseng, Y., Inglett, G.E., Carriere, C.J., Wirtz, D. 2004. Multiple-particle tracking study on microheterogeneity of Nutrim-10: a beta-glucan-rich hydrocolloidal extract [abstract]. International Congress on Rheology. p.133-134. Technical Abstract: Nutrim is a newly developed food product containing a great amount of soluble fiber b-glucan. The microstructural and micromechanical heterogeneities of Nutrim-10 suspensions were investigated by monitoring the thermally driven displacements of well-dispersed microspheres via video fluorescence microscopy. By comparing the distribution of the time-dependent mean-square displacement (MSD) of polystyrene microspheres imbedded in three concentrations of Nutrim-10 suspensions, we found that the degree of heterogeneity of the suspensions increased dramatically within a narrow range of Nutrim-10 concentrations. The ensemble-averaged MSD of 5.5% Nutrim-10 suspension exhibited a power-law behavior scaling linearly with time, which was similar to the behavior for a homogeneous aqueous glycerol solution. But the MSD distribution was wider and more asymmetric than for glycerol. Increasing Nutrim-10 concentration rendered the MSD distribution wider and more asymmetric. Multiple-particle tracking (MPT) provided a new and quantitative method to characterize the organization of plant biopolymers in suspension or solution.