PDF(Pubmed)
Abstract：
Improving the shelf lives of fruits is challenging. The biodegradable polysaccharide pullulan exhibits excellent film-forming ability, gas barrier performance, and natural decomposability, making it an optimal material for fruit preservation. To overcome problems of high cost and film porosity of existing packaging technologies, we aimed to develop pullulan-based packaging paper to enhance the shelf lives of fruits. A thin paper coating comprising a mixture of 15 wt.% pullulan solution at various standard viscosities (75.6, 77.8, and 108.5 mPa·s) with tea polyphenols (15:2) and/or vitamin C (150:1) improved the oxygen transmission rate (120-160 cm3 m-2·24 h·0.1 MPa), water vapor transmission rate (<5.44 g·mm-1 m-2·h·kPa), maximum free radical clearance rate (>87%), and antibacterial properties of base packaging paper. Grapes wrapped with these pullulan-based papers exhibited less weight loss (>4.41%) and improved hardness (>16.4%) after 10 days of storage compared to those of control grapes (wrapped in untreated/base paper). Grapes wrapped with pullulan-based paper had >12.6 wt.% total soluble solids, >1.5 mg/g soluble protein, >0.44 wt.% titratable acidity, and ≥4.5 mg 100 g-1 ascorbic acid. Thus, pullulan-based paper may prolong the shelf life of grapes with operational convenience, offering immense value for fruit preservation.
摘要：
提高水果的保质期是具有挑战性的。生物可降解多糖普鲁兰表现出优异的成膜能力，气体阻隔性能，和自然可分解性，使其成为水果保鲜的最佳材料。为了克服现有包装技术的高成本和薄膜孔隙率的问题，我们旨在开发基于普鲁兰的包装纸，以提高水果的保质期。一种薄纸涂层,其包含15重量%的混合物。％的普鲁兰溶液在各种标准粘度（75.6，77.8和108.5mPa·s）与茶多酚（15：2）和/或维生素C（150：1）改善了氧气透过率（120-160cm3m-2·24h·0.1MPa），水蒸气透过率(<5.44g·mm-1m-2·h·kPa),最大自由基清除率（>87%），基础包装纸的抗菌性能。与对照葡萄(包裹在未处理/原纸中)相比,用这些基于支链淀粉的纸包裹的葡萄在储存10天后表现出较少的重量损失(>4.41%)和改善的硬度(>16.4%)。用基于普鲁兰的纸包裹的葡萄的重量>12.6。%总可溶性固形物，>1.5mg/g可溶性蛋白质，>0.44wt。可滴定酸度%,和≥4.5毫克100克-1抗坏血酸。因此，支链淀粉纸可以延长葡萄的保质期，操作方便，为水果保存提供巨大的价值。
