Physical stability and rheological properties of konjac glucomannan-ethyl cellulose mixed emulsions

Xuewen Ni, Wenjie Chen, Man Xiao, Kao Wu, Ying Kuang, Harold Corke, Fatang Jiang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Konjac glucomannan (KGM)/ethyl cellulose (EC) could form a stable homogeneous emulsion with appropriate mixing formula. This study aimed to investigate the stable mechanism of KGM/EC emulsion at different mixing ratio through its rheological properties, and droplet size and morphology changes with up to 6 days storage time. Though emulsions samples with high KGM content had larger droplet size and worse uniformity at the fresh stage, they appeared to be more stable and droplets growth rate were slow during storage. Aggregation and morphology of droplets could be observed under confocal microscopy. Shear-thinning behavior were found in mixed emulsions, and mainly accredited to the KGM component. The effect of temperature on viscosities of the emulsions was well-described by Arrhenius equation. Increased KGM content led to larger storage modulus (G′) and loss modulus (G″), and the difference in cross-over point of G′ and G″ implied changes in microstructures of the emulsions.

Original languageEnglish
Pages (from-to)423-430
Number of pages8
JournalInternational Journal of Biological Macromolecules
Volume92
DOIs
StatePublished - 1 Nov 2016
Externally publishedYes

Keywords

  • droplet morphology
  • phase separation
  • rheological properties

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