Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China.
Faculty of Food Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China.
Food Chem. 2024 Aug 1;448:139143. doi: 10.1016/j.foodchem.2024.139143. Epub 2024 Mar 26.
Sustainable carboxymethyl cellulose (CMC)-based active composite films were developed through the addition of polyphenol-rich extract from coffee husk (CHE) and carbon dots (CDs) prepared using the biowaste residue of CHE extraction. The influences of various CDs contents on the physicochemical and functional characteristics of composite films have been researched. The 6% (w/w) CHE and 3% (w/w) CDs were uniformly dispersed within the CMC matrix to produce a homogenous film with enhanced mechanical properties. The CMC/CHE/CDs3% film exhibited outstanding UV-light blocking, improved water and gas barriers, potent antioxidant activity with above 95% DPPH and ABTS scavenging rates, and effective antibacterial capabilities against L. monocytogenes and E. coli. The food packaging experiment demonstrated that this active composite film slowed the rotting of fresh-cut apples and extended their shelf-life to 7 days at 4 °C storage. Therefore, the obtained multifunctional film showed promise as an environmentally friendly food packaging material.
通过添加富含多酚的咖啡壳提取物（CHE）和使用 CHE 提取的生物废料制备的碳点（CDs），开发出可持续的羧甲基纤维素（CMC）基活性复合膜。研究了不同 CDs 含量对复合膜物理化学和功能特性的影响。6%（w/w）的 CHE 和 3%（w/w）的 CDs 在 CMC 基质中均匀分散，形成具有增强机械性能的均匀薄膜。CMC/CHE/CDs3%薄膜具有出色的紫外线阻挡性能，提高了水和气体阻隔性能，具有超过 95%的 DPPH 和 ABTS 清除率的强大抗氧化活性，以及对单核细胞增生李斯特菌和大肠杆菌的有效抗菌能力。食品包装实验表明，这种活性复合膜可减缓鲜切苹果的腐烂速度，并将其在 4°C 储存下的保质期延长至 7 天。因此，所获得的多功能膜有望成为一种环保的食品包装材料。
