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Effect of food simulants on stability of copper oxide in bionanocomposite food packaging film
Packaging Technology and Science ( IF 2.8 ) Pub Date : 2023-04-20 , DOI: 10.1002/pts.2734 Nattinee Bumbudsanpharoke 1 , Busarin Chongcharoenyanon 1 , Nathdanai Harnkarnsujarit 1 , Seongyoung Kwon 2 , Seonghyuk Ko 2
Packaging Technology and Science ( IF 2.8 ) Pub Date : 2023-04-20 , DOI: 10.1002/pts.2734 Nattinee Bumbudsanpharoke 1 , Busarin Chongcharoenyanon 1 , Nathdanai Harnkarnsujarit 1 , Seongyoung Kwon 2 , Seonghyuk Ko 2
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Addition of copper oxide nanoparticles (CuONPs) to poly (butylene-adipate-co-terephthalate) (PBAT)/thermoplastic starch (TPS) biopolymer blend produced bionanocomposite films with improved mechanical and oxygen barrier properties, as well as enhanced other benefits including antimicrobial activity. In this study, the PBAT/TPS-CuO bionanocomposite films with varying CuONPs contents (0.05%, 0.5%, 1%, and 2%) were challenged by food simulants (10% ethanol represented to aqueous food and 3% acetic acid represented to acidic food) in accordance with European Regulation 10/2011. CuONPs in the bionanocomposite films demonstrated good stability when exposed to 10% ethanol; however, it was dissolved in 3% acetic acid. The X-ray diffraction and the energy dispersive spectroscopy results showed that CuONPs in the film were completely lost after acid exposure, whereas CuONPs in the films exposed to 10% EtOH were preserved. The maximum overall migration value was 5.0 mg/dm2. Inductively coupled plasma optical emission spectroscopy was used to confirm the presence of Cu in the simulants. The highest soluble Cu value of 12.39 mg/kg was detected from PBAT/TPS-CuO2%, while migration value decreased as concentration ratio in film decreased. Although both values were within the threshold limits established by current legislation for non-specific migration limit substances in food contact materials, the properties of bionanocomposite were altered. The mechanical properties of a post-migrated PBAT-TPS/CuO films taken from acidic conditions were reduced by 22% in tensile strength and 53% in elongation at break due to holes and microcracks on the film surface observed by scanning electron microscope. The average sealing strength of all bionanocomposite films decreased by about 25% after acid exposure. The oxygen permeability, on the other hand, was significantly improved, with a 16.3% reduction. Because the film had lost all of its active agent, film was unable to inhibit Escherichia coli growth. While 3% acetic acid caused dissolution of CuONPs and significant changes in properties of PBAT/TPS-CuO film, 10% ethanol caused very minor to no changes in bionanocomposite film properties.
中文翻译：
食品模拟剂对生物纳米复合食品包装膜中氧化铜稳定性的影响
将氧化铜纳米颗粒 (CuONP) 添加到聚己二酸对苯二甲酸丁二醇酯 (PBAT)/热塑性淀粉 (TPS) 生物聚合物混合物中，可生产出具有改善的机械和氧气阻隔性能以及增强的其他优点（包括抗菌活性）的生物纳米复合材料薄膜。在这项研究中，具有不同 CuONPs 含量（0.05%、0.5%、1% 和 2%）的 PBAT/TPS-CuO 生物纳米复合薄膜受到食品模拟物的挑战（10% 乙醇代表水性食品，3% 乙酸代表水性食品）。酸性食品）符合欧洲法规 10/2011。生物纳米复合膜中的 CuONPs 在暴露于 10% 乙醇时表现出良好的稳定性；然而，它溶解在3%的乙酸中。X射线衍射和能量色散谱结果表明，酸处理后薄膜中的CuONPs完全消失，而暴露于 10% EtOH 的薄膜中的 CuONP 得以保留。最大总迁移量为5.0 mg/dm2。使用电感耦合等离子体发射光谱来确认模拟物中铜的存在。PBAT/TPS-CuO2%中检测到的可溶性Cu值最高为12.39 mg/kg，但迁移值随着膜中浓度比的降低而降低。尽管这两个值均在现行立法针对食品接触材料中非特定迁移限制物质规定的阈值范围内，但生物纳米复合材料的性能发生了变化。扫描电子显微镜观察到，由于薄膜表面存在孔洞和微裂纹，酸性条件下迁移后的PBAT-TPS/CuO薄膜的机械性能拉伸强度降低了22%，断裂伸长率降低了53%。所有生物纳米复合材料薄膜的平均密封强度在酸暴露后下降了约25%。透氧性、另一方面则明显改善，下降了16.3%。由于薄膜失去了所有的活性剂，薄膜无法抑制大肠杆菌生长。3% 的乙酸会导致 CuONP 溶解并显着改变 PBAT/TPS-CuO 薄膜的性能，而 10% 的乙醇则对生物纳米复合材料薄膜的性能造成非常轻微的变化甚至没有变化。
更新日期：2023-04-20
中文翻译：
食品模拟剂对生物纳米复合食品包装膜中氧化铜稳定性的影响
将氧化铜纳米颗粒 (CuONP) 添加到聚己二酸对苯二甲酸丁二醇酯 (PBAT)/热塑性淀粉 (TPS) 生物聚合物混合物中，可生产出具有改善的机械和氧气阻隔性能以及增强的其他优点（包括抗菌活性）的生物纳米复合材料薄膜。在这项研究中，具有不同 CuONPs 含量（0.05%、0.5%、1% 和 2%）的 PBAT/TPS-CuO 生物纳米复合薄膜受到食品模拟物的挑战（10% 乙醇代表水性食品，3% 乙酸代表水性食品）。酸性食品）符合欧洲法规 10/2011。生物纳米复合膜中的 CuONPs 在暴露于 10% 乙醇时表现出良好的稳定性；然而，它溶解在3%的乙酸中。X射线衍射和能量色散谱结果表明，酸处理后薄膜中的CuONPs完全消失，而暴露于 10% EtOH 的薄膜中的 CuONP 得以保留。最大总迁移量为5.0 mg/dm2。使用电感耦合等离子体发射光谱来确认模拟物中铜的存在。PBAT/TPS-CuO2%中检测到的可溶性Cu值最高为12.39 mg/kg，但迁移值随着膜中浓度比的降低而降低。尽管这两个值均在现行立法针对食品接触材料中非特定迁移限制物质规定的阈值范围内，但生物纳米复合材料的性能发生了变化。扫描电子显微镜观察到，由于薄膜表面存在孔洞和微裂纹，酸性条件下迁移后的PBAT-TPS/CuO薄膜的机械性能拉伸强度降低了22%，断裂伸长率降低了53%。所有生物纳米复合材料薄膜的平均密封强度在酸暴露后下降了约25%。透氧性、另一方面则明显改善，下降了16.3%。由于薄膜失去了所有的活性剂，薄膜无法抑制大肠杆菌生长。3% 的乙酸会导致 CuONP 溶解并显着改变 PBAT/TPS-CuO 薄膜的性能，而 10% 的乙醇则对生物纳米复合材料薄膜的性能造成非常轻微的变化甚至没有变化。
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