PLLA-ZIF-8 metal organic framework composites for potential use in food applications: Production, characterization and migration studies,Packaging Technology and Science

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PLLA-ZIF-8 metal organic framework composites for potential use in food applications: Production, characterization and migration studies
Packaging Technology and Science ( IF 2.8 ) Pub Date : 2021-03-28 , DOI: 10.1002/pts.2569
Ajay Kathuria ₁ , Mohamad G. Abiad _{2,

3} , Rafael Auras ₃

Affiliation

PLLA-15% ZIF-8 MOF composites were fabricated by melt compounding followed by injection molding for active packaging applications. The injection-molded discs were then converted into films by compression molding. The samples were morphological and thermally characterized. Migration studies using Atomic Absorption Spectrometry were conducted on the successful produced PLLA and PLLA-15% MOF films incubated at 40°C for 240 h with two simulants, Simulant A: aqueous and acidic foods with 10% ethanol, and Simulant B: low and high alcoholic foods with 50% ethanol as per the U.S. Food and Drug Administration guidelines for packaging application testing. After 240 h Zn²⁺ ion concentrations in Simulants A and B were 354 and 166 mg L⁻¹, respectively. Higher Zn²⁺ ion migration observed in Simulant A can be ascribed to the decomposition of the ZIF-8 MOF under acidic environment. Thermo-gravimetric studies indicated that the thermal stability of PLLA dropped from 338°C to 207°C with the addition of ZIF-8 MOF, which may be credited to the catalytic depolymerization effect of the MOF. Due to high migration, the studied composite films are not suitable for direct food contact applications in their present form. Future work must be directed to explore how to engineer these composites for food contact applications.

中文翻译：

PLLA-ZIF-8 金属有机骨架复合材料在食品应用中的潜在用途：生产、表征和迁移研究

PLLA-15% ZIF-8 MOF 复合材料通过熔融复合然后注塑成型，用于活性包装应用。然后通过压缩成型将注塑成型的圆盘转化为薄膜。对样品进行形态学和热表征。使用原子吸收光谱法对成功生产的 PLLA 和 PLLA-15% MOF 薄膜与两种模拟物在 40°C 下孵育 240 小时进行了迁移研究，模拟物 A：含有 10% 乙醇的水性和酸性食品，以及模拟物 B：低和根据美国食品和药物管理局的包装应用测试指南，含 50% 乙醇的高酒精食品。240 小时后，模拟物A 和B 中的Zn ²⁺离子浓度分别为354 和166 mg L ^-1。高锌²⁺在模拟物 A 中观察到的离子迁移可归因于 ZIF-8 MOF 在酸性环境下的分解。热重研究表明，随着 ZIF-8 MOF 的加入，PLLA 的热稳定性从 338°C 下降到 207°C，这可能归因于 MOF 的催化解聚作用。由于迁移率高，所研究的复合薄膜不适合目前形式的直接食品接触应用。未来的工作必须致力于探索如何为食品接触应用设计这些复合材料。

更新日期：2021-06-03

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