|Chang, Tungsun - JOHNS HOPKINS UNIVERSITY|
|Tseng, Yiider - JOHNS HOPKINS UNIVERSITY|
|Wirtz, Denis - JOHNS HOPKINS UNIVERSITY|
Submitted to: Polymer Processing Society
Publication Type: Abstract Only
Publication Acceptance Date: July 6, 2006
Publication Date: July 6, 2006
Citation: Xu, J., Chang, T., Inglett, G.E., Kim, S., Tseng, Y., Wirtz, D. 2006. Micro-heterogeneity and micro-rheological properties of beta-glucan solutions [abstract]. Polymer Processing Society. p. 291. Technical Abstract: Beta-glucan is one of the key materials in healthy food products, which can reduce serum cholesterol levels. The micro-structural heterogeneity and micro-rheology of beta-glucan solutions 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) and ensemble-averaged MSD of polystyrene microspheres imbedded in four concentrations of high-viscosity oat beta-glucan solutions, we found that the solutions exhibited perfectly homogeneous behavior at less than or equal to 1%, but the material showed a certain degree of heterogeneity at 2%. Micro-rheology investigation revealed that beta-glucan solutions displayed nearly perfect viscous behavior at less than or equal to 1%, but the property became viscoelastic at 2%. Both of the micro-structural heterogeneity and micro-rheological property shifts occurred between 1% and 2% of beta-glucan, which is a small concentration range.