纳米TiO2可降解包装材料对葡萄的保鲜效果研究

Preservation Effect of Nano-TiO2 Degradable Packaging Materials on Grapes

中文关键词: 抑菌保鲜膜  纳米TiO2  PBAT/PLA  葡萄  保鲜

英文关键词: antibacterial plastic wrap  nano-TiO2  PBAT/PLA  grape  preservation

中文摘要:

      目的 针对果蔬保鲜时存在的失水、霉变和腐烂等现象，以聚己二酸/对苯二甲酸丁二酯（polyadipate/butylene terephthalate, PBAT）、聚乳酸（polylactic acid, PLA）为基材，添加纳米TiO2作为功能助剂，研发具有抑菌功能的PBAT/PLA纳米活性包装材料，并研究其对葡萄贮藏期的影响。方法 采用共混熔融吹塑工艺，通过调控基材配伍，实现包装对果蔬表面的抑菌作用，研制出纳米TiO2可降解包装膜，并以葡萄为实验材料，利用该保鲜膜对其进行自发气调贮藏，通过测定葡萄果实的好果率、质量损失率、可溶性固形物含量、总酸含量、过氧化氢酶活性和花青素含量等指标，研究保鲜膜对葡萄贮藏品质的影响。结果 实验结果表明，该保鲜膜的力学性能和透气透湿性能均良好，当纳米TiO2添加量（以质量分数计）为1%时对葡萄的保鲜效果最佳，贮藏28 d后葡萄好果率为81.8%，质量损失率为12.8%，过氧化氢酶活性为0.0438 U/(min•g)，花青素含量为0.87 mg/g。结论 纳米TiO2可降解包装膜可明显减少葡萄掉粒，抑制葡萄腐败，减缓霉变速度，保持较高的花青素含量，对葡萄具有较好的保鲜效果。

英文摘要:

      The work aims to develop the PBAT/PLA nano-active packaging material with antibacterial function, with polyadipate/butylene terephthalate (PBAT) and polylactic acid (PLA) as substrates, and nano-TiO2 as a functional additive, and study its effect on grape storage period, so as to solve the problems of water loss, mildew and decay in the preservation of fruits and vegetables. The blending melt blow molding process was adopted and the substrate compatibility was controlled to achieve the antibacterial effect of packaging on the surface of fruits and vegetables. The nano-TiO2 degradable packaging film was developed. With the grapes as experimental materials, the packaging film was used for the modified atmosphere storage of the grapes. The effects of packaging films on grape storage quality were studied by measuring the fruit yield, weight loss rate, soluble solid content, total acid content, catalase activity and anthocyanin content. The experimental results showed that, the mechanical properties and breathability and water vapor permeability of the packaging films were good. When the addition amount of nano-TiO2 was 1% (in mass fraction), the fresh-keeping effect of the grape was the best. After 28 days of storage, the grape yield rate was 81.8%, the weight loss rate was 12.8%, the catalase activity was 0.0438 U/(min•g), and the anthocyanin content was 0.87 mg/g. Nano-TiO2 degradable packaging film can significantly reduce grape granules, inhibit grape spoilage, slow down the rate of mildew, maintain high anthocyanin content, and has good preservation effect on grapes.