Abstract
The call to use biodegradable, eco-friendly materials is urgent. The use of biopolymers as a replacement for the classic petroleum-based materials is increasing. Chitosan and starch have been widely studied with this purpose: to be part of this replacement. The importance of proper physical characterization of these biopolymers is essential for the intended application. This review focuses on characterizations of chitosan and starch, approximately from 2017 to date, in one of their most-used applications: food packaging for chitosan and as an adsorbent agent of pollutants in aqueous medium for starch.
Highlights
The use of petroleum-based materials has been very effective and has improved our quality of life
This study demonstrates that in the case of CS-based films, the barrier properties can be improved with the incorporation of various components chemically compatible with the CS polymer matrix
The results regarding the inhibition rate (% IR) at the contact surface were expressed as a percentage. % IR against the fungus Aspergillus brasiliensis varied between 99% and 100% in the contact surface for both samples composed of PLA/CS, in the form of films and sheets, and they were compared with samples without CS
Summary
The use of petroleum-based materials has been very effective and has improved our quality of life. The blending between polymers, biopolymers, or composites is a cheap alternative that allows obtaining the desired material through the interactions In this way, chitosan and starch have been involved in several studies using this technique. The focus on biopolymers such as CS has increased due to the shortage of the fossil fuel reserve and the environmental impact induced by the accumulation of non-biodegradable plastic-based traditional packaging materials. This serious problem affects marine life and humans, as microplastics can enter the food chain and eventually harm health [74]. Are a series of analyses used to characterize chitosan-based films, including their mechanical, physical, and thermal properties, among others
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