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Journal of Food Measurement and Characterization

, Volume 13, Issue 4, pp 2822–2827 | Cite as

Micro-rheological and micro-heterogeneity properties of soluble glutinous rice starch (SGRS) solutions studied by diffusing wave spectroscopy (DWS)

  • Jingyuan XuEmail author
  • Sean X. Liu
  • Veera M. Boddu
Original Paper
  • 17 Downloads

Abstract

As a natural biopolymer, soluble glutinous rice starch (SGRS) is widely used in the food industry; and has better binding characteristics than dextrin. The micro-structural heterogeneity and micro-rheology of SGRS solutions were investigated by the novel technique diffusion wave spectroscopy (DWS). By comparing the mean-square displacement (MSD) of the microbeads imbedded in six concentrations of SGRS solutions, we found that the solutions exhibited nearly homogeneous behavior at ≤ 0.5%, but the material displayed a clear degree of heterogeneity at > 1%. Micro-rheology investigation revealed that SGRS solutions showed nearly perfect viscous behavior at ≤ 0.5%, but the property changed into viscoelastic one at > 1%. The magnitude of high-frequency viscoelastic moduli for the 3–5% SGRS solutions can be characterized by \(\left| {{\text{G}}^{ * } } \right|\) ∝ ω3/4, which is the semi-flexible polymer behavior. However, the magnitude of high-frequency viscoelastic moduli (\(\left| {{\text{G}}^{ * } } \right|\)) for the 7–10% SGRS solutions is proportional to ω1/2, which is the flexible polymer behavior. All micro-structural heterogeneity and micro-rheological property shifts occurred in relatively small concentration ranges.

Keywords

Diffusing wave spectroscopy (DWS) Micro-rheology Soluble rice starch 

Notes

Acknowledgements

This work was financially supported by US Department of Agriculture, Agricultural Research Service.

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Copyright information

© This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply 2019

Authors and Affiliations

  1. 1.National Center for Agricultural Utilization Research, Agricultural Research ServiceUS Department of AgriculturePeoriaUSA

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