Preparation of modified bamboo fiber/PLA composite and its application in strawberry packaging

  • LUO Guorong ,
  • GAO Xijie ,
  • LI Wanju ,
  • XU Dan ,
  • REN Dan
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  • 1(School of Food Science, Southwest University, Chongqing 400715, China)
    2(Guangdong Key Laboratory of Forest Cultivation, Protection and Utilization, Guangzhou 510520, China)
    3(Fruit and Vegetable Logistics Preservation and Nutrition Quality Control Research Center, Southwest University, Chongqing 400715, China)

Received date: 2024-03-07

  Revised date: 2024-04-13

  Online published: 2025-03-28

Abstract

With the increasing awareness of green environmental protection, food packaging with degradable plant fiber/polymer composite materials has been widely concerned.However, the interfacial incompatibility between hydrophilic bamboo fiber (BF) and hydrophobic polylactic acid (PLA) weakens the mechanical strengthening effect of BF in composite materials, making the regulation of interfacial properties crucial.Firstly, the effect of BF modified by graphene oxide (GO) on the properties of PLA-matrix composites were investigated.Subsequently, the PLA-based composite material was used as a strawberry tray packaging to explore its influence on the storage quality of strawberries.It was found that the addition of fiber could improve the modulus of the composite, and the improvement effect of GOBF/PLA was the most significant (compared with pure PLA, the bending and tensile modulus of GOBF/PLA were increased by 16.39% and 35.90%, respectively).GOBF/PLA had higher glass transition temperature and better interface bonding performance.Compared to BF, GOBF possessed stronger heterogeneous nucleation capability resulting in lower cold crystallization temperature values and higher crystallinity values for GOBF/PLA.The SEM analysis revealed that the cross-section after bending failure of BF/PLA exhibited numerous holes and micro-cracks;conversely, GOBF/PLA displayed fewer micro-cracks.The addition of hydrophilic fiber reduced the strength and hydrophobicity of the composite, but the effect of GOBF on the strength and hydrophobicity of the composite was less than that of BF.The results of strawberry storage showed that GOBF/PLA could significantly reduce the decay rate of strawberry fruits and delay the decrease of titrable acid content in strawberry fruits at the later stage of storage, which had better fresh-keeping effect on strawberry fruits.In conclusion, this study can provide reference for the development and application of disposable green fruit and vegetable trays.

Cite this article

LUO Guorong , GAO Xijie , LI Wanju , XU Dan , REN Dan . Preparation of modified bamboo fiber/PLA composite and its application in strawberry packaging[J]. Food and Fermentation Industries, 2025 , 51(5) : 254 -263 . DOI: 10.13995/j.cnki.11-1802/ts.039139

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