Journal
CRITICAL REVIEWS IN FOOD SCIENCE AND NUTRITION
Volume 63, Issue 21, Pages 5044-5062Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/10408398.2021.2012420
Keywords
Ultrasonication; biopolymer; film; physicochemical properties
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Biopolymeric films, made from materials such as starch, cellulose, protein, chitosan, gelatin, and polyvinyl alcohol, have complete biodegradability. However, these films often have poor moisture resistance and mechanical properties. Ultrasonication, a promising technology, can improve the physicochemical properties of biopolymeric films, including mechanical properties, transparency, color, microstructure, gas permeability, and thermal performance.
Biopolymeric films manufactured from materials such as starch, cellulose, protein, chitosan, gelatin, and polyvinyl alcohol are widely applied due to their complete biodegradability. While biopolymer-based films exhibit good gas barriers and optical properties when used in packaging, poor moisture resistance and mechanical properties limit their further application. Ultrasonication is a promising, effective technology for resolving these shortcomings, with its high efficiency, environmentally friendly nature, and safety. This review briefly introduces basic ultrasonication principles and their main effects on mechanical properties, transparency, color, microstructure, water vapor permeability, and oxygen resistance. We also describe the thermal performance of biopolymeric films. While ultrasonication has many positive effects on the physicochemical properties of biopolymeric films, many factors influence their behavior during film preparation, including power density, amplitude, treatment time, frequency, and the inherent properties of the source materials. This review focuses on biopolymers as film-forming materials and comprehensively discusses the promotional effects of ultrasonication on their physicochemical properties.
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