Petaloti Argyri-Ioanna, Paraskevopoulou Adamantini, Achilias Dimitris S
Laboratory of Polymer and Color Chemistry and Technology, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
Laboratory of Food Chemistry and Technology, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
Molecules. 2025 Mar 20;30(6):1383. doi: 10.3390/molecules30061383.
In the food packaging industry, significant efforts have been dedicated to addressing the pressing market demand for environmentally friendly and sustainable products. Biocomposite films based on compostable and biobased polymers represent a sustainable alternative to conventional packaging materials, offering biodegradability and enhanced functional properties. Additionally, there is growing interest in utilizing waste materials from agriculture and the food industry. This study focuses on the development of multifunctional eco-sustainable biocomposite films by combining poly(lactic acid) (PLA) as a biopolymeric matrix and extracts derived from coffee silverskin (CS), a significant agro-industrial waste byproduct of the coffee roasting process. Extracts of coffee silverskin were obtained via extraction with several solvents. Several properties of the prepared biocomposites were measured using techniques such as scanning electron microscopy (SEM), infrared spectroscopy (FTIR, ATR), differential scanning calorimetry (DSC), and oxygen and water vapor permeability, together with mechanical and physico-chemical characterization and measurements of water content, film solubility, and degree of swelling. The results demonstrate that optimized formulations of PLA/CS biocomposite films exhibit enhanced oxygen barrier properties, reduced permeability, and significant antioxidant activity. These findings underscore the potential for agro-waste valorization in creating eco-friendly food packaging solutions.
在食品包装行业，人们已经做出了巨大努力来满足市场对环保和可持续产品的迫切需求。基于可堆肥和生物基聚合物的生物复合薄膜是传统包装材料的可持续替代品，具有生物降解性和增强的功能特性。此外，利用农业和食品工业废料的兴趣也在日益增加。本研究重点在于通过将聚乳酸（PLA）作为生物聚合物基质与咖啡银皮（CS）提取物相结合来开发多功能生态可持续生物复合薄膜，咖啡银皮是咖啡烘焙过程中一种重要的农业工业废料副产品。咖啡银皮提取物通过几种溶剂萃取获得。使用扫描电子显微镜（SEM）、红外光谱（FTIR、ATR）、差示扫描量热法（DSC）以及氧气和水蒸气渗透性等技术，连同机械和物理化学表征以及水分含量、薄膜溶解度和溶胀度的测量，对制备的生物复合材料的几种性能进行了测定。结果表明，PLA/CS生物复合薄膜的优化配方具有增强的氧气阻隔性能、降低的渗透性和显著的抗氧化活性。这些发现强调了农业废料增值在创造环保食品包装解决方案方面的潜力。
