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Heterogeneity in Diameters of Protein Fibrils and Chitosan for a High CO2/O2 Selectivity and Desired Mechanical Properties of Edible Bioplastic Films

Published:10 December 2024 DOI: 10.1002/smll.202405346
Qixin Shi, Yingqun Nian, Yang You, Ziyan Li, Yunqi Li, Ran Zhao, Zhengzhi Chen, Tianhang Huang, Bing Hu

Abstract

Edible bioplastics offer a possible approach with great potential to address the challenges of plastic and microplastic crisis and the issue of food waste. In the present study, in situ, induction of fibrillation of legume proteins within chitosan matrix is found to form edible bioplastic films with a high CO2/O2 selectivity coefficient of ≈130. Desirable mechanical properties, including a high elongation at break of ≈230%, are realized to fabricate shopping bags, which can be filled with 5?kg of fruits. An atmosphere with a high CO2 content and low O2 concentration is spontaneously achieved after strawberries are packaged with the films and ≈85% of the fruits are edible after 9 days. The contents of CO2 in the equilibrium state and the percent of edible fruits are positively correlated with the CO2/O2 selectivity of the films. By comparison of the edible bioplastic films made from mung bean protein (MP) and pea protein (PP), the fibrillation capability of legume proteins and the heterogeneity in polydisperse diameters of the protein fibrils and chitosan are demonstrated to make great contributions to the dense microstructure, leading to the strong mechanical properties and high gas selectivity of the films. The structure-property relationship is elucidated for high-performance bioplastics films.

Substances (5)

Materials
Procduct Name CAS Molecular Formula Supplier Price
Glycerol 56-81-5 C3H8O3 1786 suppliers $5.00-$6250.00
Acetic acid 64-19-7 C2H4O2 1628 suppliers $10.00-$8459.00
Sodium carbonate 497-19-8 CH2O3.2Na 1491 suppliers $14.00-$4640.00
Chitosan 9012-76-4 C6H11NO4X2 859 suppliers $14.00-$1125.56
Methanol 67-56-1 CH4O 833 suppliers $9.00-$7620.00

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