UV Protective, Antioxidant, Antibacterial and Compostable Polylactic Acid Composites Containing Pristine and Chemically Modified Lignin Nanoparticles.
UV Protective, Antioxidant, Antibacterial and Compostable Polylactic Acid Composites Containing Pristine and Chemically Modified Lignin Nanoparticles.
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DOI：
10.3390/molecules26010126
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发表时间：
2020-12-29
期刊：
影响因子：
--
通讯作者：
Puglia D
中科院分区：
文献类型：
--
作者：
Cavallo E;He X;Luzi F;Dominici F;Cerrutti P;Bernal C;Foresti ML;Torre L;Puglia D
通过挤出制备含有1重量%和3重量%的木质素纳米颗粒（原始（LNP）、用柠檬酸化学改性（caLNP）和乙酰化（aLNP））的聚乳酸（PLA）膜，并根据其作为食品包装材料的总体性能对其进行表征。形态，机械，热，紫外-可见光阻隔，抗氧化和抗菌性能进行了分析，适当的迁移值在食品模拟物和模拟堆肥条件下的崩解也进行了验证。结果表明，所有的木质素纳米粒子成功地赋予紫外线阻断，抗氧化和抗菌性能的PLA膜，特别是在较高的填料负载量测定。填料的化学改性部分地降低了所得复合材料的UV保护和抗氧化性能，但其通过减少木质素的特征深色而诱导更好的纳米颗粒分散、减小聚集体尺寸、增强延展性和改善膜的美学质量。模拟堆肥条件下的纳米复合材料的迁移试验和崩解试验表明，无论其配方，制备的多功能纳米复合材料膜表现类似于纯PLA。
Polylactic acid (PLA) films containing 1 wt % and 3 wt % of lignin nanoparticles (pristine (LNP), chemically modified with citric acid (caLNP) and acetylated (aLNP)) were prepared by extrusion and characterized in terms of their overall performance as food packaging materials. Morphological, mechanical, thermal, UV–Vis barrier, antioxidant and antibacterial properties were assayed; appropriate migration values in food simulants and disintegration in simulated composting conditions were also verified. The results obtained indicated that all lignin nanoparticles succeeded in conferring UV-blocking, antioxidant and antibacterial properties to the PLA films, especially at the higher filler loadings assayed. Chemical modification of the fillers partially reduced the UV protection and the antioxidant properties of the resulting composites, but it induced better nanoparticles dispersion, reduced aggregates size, enhanced ductility and improved aesthetic quality of the films through reduction of the characteristic dark color of lignin. Migration tests and disintegration assays of the nanocomposites in simulated composting conditions indicated that, irrespectively of their formulation, the multifunctional nanocomposite films prepared behaved similarly to neat PLA.
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