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<p>Soy protein isolate (SPI), an abundant, cheap, and renewable industrial raw material, is an eco-friendly alternative to fossil fuels. However, the poor mechanical properties and high water sensitivity of SPI films limit their practical application. In this study, biodegradable films were prepared by using soybean protein isolate (SPI), glycerol, nano-zinc oxide (ZnONPs), and trimethylol propane triglycidyl ether (TMPGE) as raw materials, and the physical properties, chemical structure, thermal stability, and morphology of the composite films were fully analyzed. The effects of ZnONPs and TMPGE on the properties of the films were studied by FTIR, SEM, XRD, and TGA. The results showed that compared with the unmodified SPI film, the tensile modulus and tensile strength of TMPGE-modified film were increased by 32.42% and 44.77%, respectively, and the water content and water absorption were decreased by 16.33% and 79.33%, respectively, which can effectively prevent the swelling of SPI film due to the formation of a&#xa0;chemical crosslinking network between SPI, M-ZnONPs and TMPGE. After modification, the composite films also displayed good antibacterial activity against <i>E.&#xa0;coli</i> and <i>S.&#xa0;aureus</i> and showed broad development prospects in making green food packaging.</p>

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Preparation and properties of soybean protein isolate membrane reinforced by amino-modified ZnONPs and trimethylol propane triglycidyl ether

  • 期刊论文

  • 发表日期：

    2025年9月3日

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  • Yanling Jiang,
  • Xiaojie Xie,
  • Guofu Wen,
  • Qiong Jiang,
  • Ningjing Sun,
  • Zhiyong Qin

摘要

Soy protein isolate (SPI), an abundant, cheap, and renewable industrial raw material, is an eco-friendly alternative to fossil fuels. However, the poor mechanical properties and high water sensitivity of SPI films limit their practical application. In this study, biodegradable films were prepared by using soybean protein isolate (SPI), glycerol, nano-zinc oxide (ZnONPs), and trimethylol propane triglycidyl ether (TMPGE) as raw materials, and the physical properties, chemical structure, thermal stability, and morphology of the composite films were fully analyzed. The effects of ZnONPs and TMPGE on the properties of the films were studied by FTIR, SEM, XRD, and TGA. The results showed that compared with the unmodified SPI film, the tensile modulus and tensile strength of TMPGE-modified film were increased by 32.42% and 44.77%, respectively, and the water content and water absorption were decreased by 16.33% and 79.33%, respectively, which can effectively prevent the swelling of SPI film due to the formation of a chemical crosslinking network between SPI, M-ZnONPs and TMPGE. After modification, the composite films also displayed good antibacterial activity against E. coli and S. aureus and showed broad development prospects in making green food packaging.