Abstract

To preserve quality and extend the shelf life of tomato, a bioactive edible coating was prepared using gelatin wastes from pharmaceutical industry and lyophilised blueberry juice (BJ). The effectiveness of gelatin-coating (G) and G enriched with blueberry juice (GB) was tested, monitoring carotenoids, polyphenols and flavonoids content, the antioxidant activity and the antimicrobial efficiency of coating against the native microflora.

After 7 d of storage, coated fruit showed higher phenolic and flavonoids content and increased antioxidant activity, while carotenoids were unaffected by the treatments. The growth of mesophilic bacteria of GB, and the growth of coliform bacteria of G and GB were significantly reduced during the entire period. The results indicate that GB preserved the nutritional quality of tomatoes and that BJ was able to increase the antimicrobial activity of the coating. This paves the way for a possible use of this biodegradable waste polymer as an eco-friendly coating material.

摘要

为了保持番茄的品质和延长番茄的保质期，使用来自制药行业的明胶废料和冻干蓝莓汁 (BJ) 制备了一种具有生物活性的可食用涂层。测试明胶涂层 (G) 和富含蓝莓汁 (GB) 的 G 的有效性，监测类胡萝卜素、多酚和类黄酮含量、涂层对天然微生物群落的抗氧化活性和抗菌效率。

贮藏7 d后，包衣果实酚类和黄酮类物质含量较高，抗氧化活性增强，而类胡萝卜素不受处理影响。GB的嗜温菌生长、G和GB的大肠菌群生长在整个期间显着减少。结果表明，GB 保留了西红柿的营养品质，BJ 能够增加涂层的抗菌活性。这为将这种可生物降解的废弃聚合物用作环保涂料铺平了道路。