Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 588, Issue -, Pages 531-546Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.12.075
Keywords
Coacervation; Pulsed electric fields; Mechanism; Rheology; Microstructure; Protein
Categories
Funding
- University of Otago
- Riddet Institute, a New Zealand Centre of Research Excellence - New Zealand Tertiary Education Commission
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The high incompatibility of bio-based materials can be effectively improved by modifying surface residues and using pulsed electric fields processing. However, optimization is necessary based on pH values. Excessive system perturbation and high electric field intensity can hinder gel formation.
Hypothesis: The high incompatibility of bio-based materials such as protein and polysaccharides require a series of modifications to develop stable microstructures effectively. By modifying the density and charge of surface residues, pulsed electric fields processing can improve inter/intramolecular interactions, compatibility, and microstructure of bio-based nanostructured composites. Experiment: In this work, the impact of pulsed electric fields at a specific energy of 60-700 kJ/kg (electric field strength = 1.6 kV/cm) on self-assembly of zein-chitosan-poly(vinyl alcohol)-polyethylene glycol composite dispersion was investigated at pH 4.0, 5.7, and 6.8. Findings: Superior complex coacervated matrices were assembled at pH 4.0 and 5.7 before and after pulsed electric fields treatment at a specific energy of 390-410 kJ/kg. The compact and homogenous behaviour was attributable to pulsed electric fields-induced alteration of functional group interactions in a pH-dependent manner. Irrespective of the pH, very high electric field intensity caused excessive system perturbation leading to severe fragmentation and poor development of coacervates. The crucial insights from this study reveal that the self-assembly behaviour and integration of biopolymer-based sys-tems possessing different local charges can be enhanced by optimising pulsed electric fields processing parameters and the properties of the colloidal systems such as the pH. (c) 2020 Elsevier Inc. All rights reserved.
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