Effect of Combined Microwave-ultrasound Treatment on the Properties of Soy Protein Isolate-chitosan Composite Films
Article
Figures
Metrics
Preview PDF
Reference
Related
Cited by
Materials
Abstract:
Soy protein isolate-chitosan mixtures were treated with a combination of micro and ultrasonic waves. This resultant dispersions were then used to prepare composite films using a casting-evaporation method. The effect of different microwave powder on tensile strength, elongation at break, water vapor permeability, gas permeability, and light transmittance of composite films was investigated. In addition, infrared (IR) spectroscopy and scanning electron microscopy (SEM) were also performed. The results indicated that with 500-W microwaves, the tensile strength of the composite films reached a maximum of 21.98 ± 0.54 MPa and the elongation at break reached a minimum of 13.48 ± 0.01%. In contrast, the lowest water vapor permeability [0.61 ± 0.05 × 10-12 g/(cm?s?Pa) ] and minimum oxygen permeability [1.95±0.02×10-5 cm3/(m2?d?Pa)] was obtained with 400-W microwaves. Additionally, with 300-W microwaves, carbon dioxide permeability reached a minimum value [1.58±0.12×10-5 cm3/(m2?d?Pa)]. IR analysis indicated that mechanical and barrier properties of the composite film were improved, probably resulting from hydrogen bonding or covalent bond formation between soy protein isolate and chitosan. These results indicate potential applications for soy protein isolate-chitosan composite films.
