这项研究的目标是明确找到一种替代石油基塑料薄膜的方法,这些薄膜会给环境带来负担。这是一个高度优先事项。因此,用羧甲基纤维素(CMC)(4%)制备聚合物膜,果胶(2%),和聚羟基丁酸酯(PHB)(0.5%)与不同浓度的百里酚(0.3%,0.9%,1.8%,3%,和5%),并通过溶液流延技术将甘油作为增塑剂。对所制备的薄膜进行机械测试,光学,抗菌,和抗氧化性能。薄膜F5(CMC+P+PHB+0.9%百里酚)表现出15MPa的优异拉伸强度,395MPa的杨氏模量,抗氧化活性(AA)(92%),土壤快速生物降解(21天),以及对细菌和真菌培养物如肺炎克雷伯菌的强抗菌活性,金黄色葡萄球菌,大肠杆菌,黑曲霉,还有黄曲霉.薄膜F6中百里酚含量增加(1.8%),F7(3%),和F8(5%)显示由于百里酚的疏水性而导致的机械性能降低。对于西红柿的保质期研究,F2,不含百里酚的薄膜(抗菌和抗氧化活性差),F5(薄膜具有优越的机械,光学,抗菌,和抗氧化性能),和F7(具有低机械性能的薄膜)被选择。番茄果实上的薄膜F5涂层通过防止体重减轻,延长了长达15天的保质期,保持坚固,延缓番茄红素等生化成分的变化,酚类物质,AA。基于机械,光学,抗菌,抗氧化剂,和保质期结果,薄膜F5适用于活性食品的包装和保存。实际应用:开发的活性生物可降解复合材料可用作涂层,以延长水果和蔬菜的保质期。这些涂料易于生产和应用,提供可持续的解决方案来减少食物浪费。在工业规模上,它们可以应用于食品,确保更长的新鲜度,没有任何技术挑战。
This study targets explicitly finding an alternative to petroleum-based plastic films that burden the environment, which is a high priority. Hence, polymeric films were prepared with carboxymethyl cellulose (CMC) (4%), pectin (2%), and polyhydroxybutyrate (PHB) (0.5%) with different concentrations of thymol (0.3%, 0.9%, 1.8%, 3%, and 5%) and glycerol as a plasticizer by solution casting technique. The prepared films were tested for mechanical, optical, antimicrobial, and antioxidant properties. Film F5 (CMC + P + PHB + 0.9%thymol) showed an excellent tensile strength of 15 MPa, Young\'s modulus of 395 MPa, antioxidant activity (AA) (92%), rapid soil biodegradation (21 days), and strong antimicrobial activity against bacterial and fungal cultures such as Klebsiella pneumoniae, Staphylococcus aureus, Escherichia coli, Aspergillus niger, and Aspergillus flavus. The thymol content increase in films F6 (1.8%), F7 (3%), and F8 (5%) displayed a decrease in mechanical properties due to thymol\'s hydrophobicity. For shelf life studies on tomatoes, F2, a film without thymol (poor antimicrobial and antioxidant activities), F5 (film with superior mechanical, optical, antimicrobial, and antioxidant properties), and F7 (film with low mechanical properties) were selected. Film F5 coatings on tomato fruit enhanced the shelf life of up to 15 days by preventing weight loss, preserving firmness, and delaying changes in biochemical constituents like lycopene, phenols, and AA. Based on the mechanical, optical, antimicrobial, antioxidant, and shelf life results, the film F5 is suitable for active food packaging and preservation. PRACTICAL APPLICATION: The developed active biodegradable composite can be utilized as a coating to extend the shelf life of fruits and vegetables. These coatings are easy to produce and apply, offering a sustainable solution to reduce food waste. On an industrial scale, they can be applied to food products, ensuring longer freshness without any technical challenges.