Agüero Ángel, Corral Perianes Esther, Abarca de Las Muelas Sara Soledad, Lascano Diego, de la Fuente García-Soto María Del Mar, Peltzer Mercedes Ana, Balart Rafael, Arrieta Marina Patricia
Instituto de Tecnología de Materiales (ITM), Universidad Politécnica de Valencia (UPV), Plaza Ferrándiz y Carbonell 1, 03801 Alcoy, Spain.
Departamento de Ingeniería Química Industrial y del Medio Ambiente, Escuela Técnica Superior de Ingenieros Industriales, Universidad Politécnica de Madrid (ETSII-UPM), Calle José Gutiérrez Abascal 2, 28006 Madrid, Spain.
Polymers (Basel). 2023 Jan 5;15(2):285. doi: 10.3390/polym15020285.
In this study, yerba mate waste (YMW) was used to produce a kombucha beverage, and the obtained microbial cellulose produced as a byproduct (KMW) was used to reinforce a mechanically recycled poly(lactic acid) (r-PLA) matrix. Microbial cellulosic particles were also produced in pristine yerba mate for comparison (KMN). To simulate the revalorization of the industrial PLA products rejected during the production line, PLA was subjected to three extrusion cycles, and the resultant pellets (r3-PLA) were then plasticized with 15 wt.% of acetyl tributyl citrate ester (ATBC) to obtain optically transparent and flexible films by the solvent casting method. The plasticized r3-PLA-ATBC matrix was then loaded with KMW and KMN in 1 and 3 wt.%. The use of plasticizer allowed a good dispersion of microbial cellulose particles into the r3-PLA matrix, allowing us to obtain flexible and transparent films which showed good structural and mechanical performance. Additionally, the obtained films showed antioxidant properties, as was proven by release analyses conducted in direct contact with a fatty food simulant. The results suggest the potential interest of these recycled and biobased materials, which are obtained from the revalorization of food waste, for their industrial application in food packaging and agricultural films.
在本研究中，马黛茶废料（YMW）被用于生产康普茶饮料，作为副产物产生的微生物纤维素（KMW）被用于增强机械回收的聚乳酸（r-PLA）基体。还在原始马黛茶中制备了微生物纤维素颗粒用于比较（KMN）。为了模拟生产线上被拒收的工业聚乳酸产品的再利用，将聚乳酸进行三个挤出循环，然后将所得粒料（r3-PLA）用15 wt.%的乙酰柠檬酸三丁酯（ATBC）增塑，通过溶液浇铸法获得光学透明且柔韧 的薄膜。然后将增塑的r3-PLA-ATBC基体分别填充1 wt.%和3 wt.%的KMW和KMN。增塑剂的使用使微生物纤维素颗粒在r3-PLA基体中良好分散，从而获得具有良好结构和机械性能的柔韧且透明的薄膜。此外，所得薄膜显示出抗氧化性能，这通过与脂肪类食品模拟物直接接触进行的释放分析得到了证实。结果表明，这些从食品废料再利用中获得的回收生物基材料在食品包装和农用薄膜的工业应用方面具有潜在的应用价值。
