Soy protein-polysaccharide complex coacervate under physical treatment: effects of pH, ionic strength and polysaccharide type

Guo-Yan Li, Qi-Hui Chen, Chun-Ru Su, Hao Wang, Shan He*, Jun Liu, Anindya Nag, Yang Yuan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

The objective of this paper is to explore the effects of pH, ionic strength and polysaccharide type on the aqueous phase behaviors and rheological properties of soy protein isolate-chitosan (SPI-CS) and soy protein isolate-carboxymethyl cellulose (SPI-CMC) coacervates treated by vortex fluidic device (VFD) and shear homogenization. Characterization in terms of phase behavior and microstructures depicted that the VFD and shear homogenization treatments affected only the SPI-CS complex. According to the ζ-potential values at tested pHs (3.0–8.0), both physical processing had insignificant effect on charge stabilization of protein-polysaccharide complex. Both the SPI-CS coacervates (at pH 7.0) and SPI-CMC coacervates (at pH 3.0) showed gel-type rheological behaviors (G′ > 1000 Pa), suggesting that the SPI and polysaccharides did not form complex coacervate (liquid in nature) but interpolymeric complex (solid in nature). In the absence of salt ions, independent on the type of coacervate, VFD slightly decreased the modulus (G′ < 1000 Pa) while homogenization significantly decreased the modulus (G′ < 20 Pa). Alternatively, the addition of salt ions produced an electrostatic shielding and weakened the protein-polysaccharide electrostatic interaction, resulting in a decrease of coacervate modulus. Interestingly, under certain condition, VFD treatment probably promoted the interaction between protein molecules in protein-polysaccharide coacervate, resulting in another increase in the elastic modulus of the complex coacervate.

Original languageEnglish
Article number102612
Pages (from-to)1-8
Number of pages8
JournalInnovative Food Science and Emerging Technologies
Volume68
DOIs
Publication statusPublished - Mar 2021

Keywords

  • Soy protein isolate
  • Chitosan
  • Carboxy methyl cellulose
  • Coacervate
  • Vortex fluidic device

Fingerprint

Dive into the research topics of 'Soy protein-polysaccharide complex coacervate under physical treatment: effects of pH, ionic strength and polysaccharide type'. Together they form a unique fingerprint.

Cite this