Antibacterial, Antioxidation, UV-Blocking, and Biodegradable Soy Protein Isolate Food Packaging Film with Mangosteen Peel Extract and ZnO Nanoparticles.

Xi Huang,Xin Zhou,Qingyin Dai,Zhiyong Qin

doi:10.3390/nano11123337

Abstract

The objective of this study was to prepare a functional biodegradable soy protein isolate (SPI) food packaging film by introducing a natural antimicrobial agent, mangosteen peel extract (MPE, 10 wt% based on SPI), and different concentrations of functional modifiers, ZnO NPs, into the natural polymer SPI by solution casting method. The physical, antioxidant, antibacterial properties and chemical structures were also investigated. The composite film with 5% ZnO NPs had the maximum tensile strength of 8.84 MPa and the lowest water vapor transmission rate of 9.23 g mm/m2 h Pa. The composite film also exhibited excellent UV-blocking, antioxidant, and antibacterial properties against Escherichia coli and Staphylococcus aureus. The TGA results showed that the introduction of MPE and ZnO NPs improved the thermal stability of SPI films. The microstructure of the films was analyzed by SEM to determine the smooth surface of the composite films. ATR-FTIR and XPS analyses demonstrated the strong hydrogen bonding of SPI, MPE, and ZnO NPs in the films. The presence of ZnO NPs in the composite films was also proved by EDX and XRD. These results suggest that SPI/MPE/ZnO composite film is promising for food-active packaging to extend the shelf life of food products.

Highlights

IntroductionOwning to the low cost and easy processing plastic materials are widely used for food packaging fields [1,2]
The results showed that the film did not inhibit E. coli but showed a significant inhibition circle against S. aureus, and the inhibition circle increased with the increase of cortex Phellodendron extract (CPE) content [26]
The results showed that the polyphenol-protein interaction may change the surface energy of soy protein isolate (SPI) film and enhance the surface hydrophobicity [38]

Summary

Introduction

Owning to the low cost and easy processing plastic materials are widely used for food packaging fields [1,2]. The discarded non-degradable plastics have caused serious environmental pollution and endangered human and ecological safety [3]. To alleviate the threat of “plastic pollution”, a biodegradable natural polymer film is prepared to reduce or eliminate some traditional polymer packaging materials [4]. Microbial contamination is widely recognized as a key risk that deteriorates food and affects public health [5]. Antimicrobial packaging materials have been hailed as one of the most promising active packaging technologies for increasing the shelf life of food goods by preventing spoiling and pathogenic microbe growth [6]

Objectives

Methods

Conclusion