硫化和化聚乙乙基/聚乙烯化物改性大气包装延迟了葡萄的恶化
Xianhui Tang1, Yuting Huang1, Liang Zhu1
1College of Food Science and Engineering, South China University of Technology, Guangzhou, China.
Journal of the science of food and agriculture
|January 27, 2025
概括
改性聚乙乙 (PEEK) 薄膜,称为SNPEEK/PVC膜,通过提高气体透性和选择性,显著提高葡萄的保存. 这些先进的材料可以将葡萄的保质期延长超过16天,展示了它们在食品包装中的实际价值.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
- 食品科学 食品科学 食品科学
背景情况:
- 聚乙烯基 (PEEK) 用混合硫酸和酸系统进行了修改,以提高溶解性和气体选择性透性.
- 硫化和化PEEK (SNPEEK) 变种 (SN1和SN5) 合成了不同的酸比,具有相似的酸但不同的硫基.
- 为了研究它们的结构和物理化学特性,SNPEEK/聚乙烯 (PVC) 薄膜以不同的SNPEEK含量 (0.5-2.5重量%) 制造.
研究的目的:
- 调查SNPEEK类型和内容对SNPEEK/PVC薄膜结构和性能的影响.
- 评估SNPEEK/PVC膜在提高气体透性和对CO2和O2的选择性方面的性能.
- 评估SNPEEK/PVC膜在储存期间延长葡萄的保质期方面的有效性.
主要方法:
- 通过混合酸处理PEEK合成SNPEEK变体 (SN1,SN5).
- 制造具有不同SNPEEK度的SNPEEK/PVC复合膜.
- 薄膜微观结构的特征,功能组 (-SO3H, -NO2),极性,以及气体/水分的透性.
- 在受控温度条件下评估葡萄的保存效果,评估气体度,电解质泄漏,硬度,总可溶固体和维生素C含量.
主要成果:
- 与化PEEK (NPEEK) 相比,SNPEEK具有更高的溶解度和更广泛的应用范围.
- 增加的SNPEEK含量导致了更多的微孔,增强的极性,以及更好的CO2/O2透性和选择性.
- SNPEEK/PVC膜有效地保存葡萄,在4天内达到平衡气体度,并保持更高的水果质量 (减少电解质泄漏,增加硬度,可溶性固体和维生素C).
结论:
- 在葡萄保存中,SNPEEK/PVC膜在修改大气的包装中具有显著的实际价值.
- 与未密封包装相比,1.0%的SN1/PVC和1.0%的SN5/PVC膜将葡萄的保质期分别延长了16天和8天以上.
- 该研究强调了SNPEEK/PVC材料在延长易腐烂农产品的保质期方面的潜力.
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