通过融挤出,利格宁颗粒的自我形成,用于活性生物降解食品包装
Bongkot Hararak1, Pawarisa Wijaranakul1, Wanwitoo Wanmolee2
1National Metal and Materials Technology Center (MTEC), National Science and Technology Development Agency, Khlong-Nueng, Khlong Luang, Pathumthani 12120, Thailand.
ACS omega
|June 17, 2024
概括
这项研究引入了一种新的方法,用于在挤出过程中在聚乳酸 (PLA) 中产生素颗粒,增强紫外线屏障和抗氧化特性,用于潜在的食品包装应用.
科学领域:
- 聚合物科学 聚合物科学
- 材料科学 材料科学 材料科学
- 生物材料工程 生物材料工程
背景情况:
- 微小的素颗粒往往需要复杂的分离和干燥,导致聚合问题.
- 在聚合物矩阵中利用素为增强材料性能和可持续性提供了潜力.
- 聚乳酸 (PLA) 是一种具有越来越多应用的可生物降解聚合物,但其屏障特性可能是限制性的.
研究的目的:
- 开发一种在PLA矩阵内在现场形成素颗粒的方法.
- 为了研究自我形成的素颗粒对PLA复合材料的性能的影响.
- 为了评估这些PLA/烯酸复合物的食品包装的适用性.
主要方法:
- 软木 kraft 纤维素 (guaiacyl 纤维素,GL- 纤维素) 在聚乙烯甘醇 (PEG) 中溶解.
- 素-PEG溶液用双螺杆挤出机和液体料器与PLA进行融挤出.
- 复合膜是通过吹膜挤出生产的.
主要成果:
- 在PLA矩阵内观察到200-500纳米范围的自我形成的红素粒子.
- 与纯净的PLA相比,PLA/PEG/GL-烯酸复合膜具有更好的紫外线屏障和抗氧化特性.
- 复合材料的光学和机械性能与整洁的PLA相当.
- 食品模拟剂的迁移水平低于监管限制.
结论:
- 在PLA中素颗粒的现场自我形成是一种有效的策略,可以避免聚合和处理挑战.
- 聚烯/烯复合材料表现出增强的功能,适合食品包装.
- 这种方法为在先进的应用中将素纳入PLA提供了一条可行的途径.
相关概念视频
01:25Production of Organic Acids
Lactic acid, an important organic acid extensively applied in food, pharmaceutical, and biodegradable polymer industries, is primarily produced via microbial fermentation. This method is favored over chemical synthesis due to its environmental sustainability and capacity for enantiomerically pure product formation. Among various microbial processes, the fermentation of starch-based substrates stands out due to the abundance and renewability of raw materials like corn and potatoes.Hydrolysis of...
01:27Bioplastics
Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...
01:28Microbial Bioremediation of Plastics
Polyethylene terephthalate (PET) is a synthetic polymer widely utilized in the packaging industry, particularly for bottles and containers. Due to its chemical stability and durability, PET accumulates in the environment, contributing significantly to plastic pollution. It comprises repeating units of terephthalic acid and ethylene glycol, resulting in a semi-crystalline structure that is resistant to natural degradation processes.A notable breakthrough in plastic biodegradation came with the...