复合水凝胶非织造布保鲜材料的制备及其性能

为扩展非织造布在保鲜包装材料中的应用,以具有药用价值的沙棘作为抗氧化保鲜成分原料,通过负载不同体积分数的沙棘提取物(SBT)制备罗布麻纳米纤维素/壳聚糖基水凝胶,并与聚酯非织造布复合制备复合水凝胶非织造布保鲜材料,对其阻隔性能、释放行为、抗氧化活性、抗菌性以及保鲜性能进行分析。结果表明:随着SBT体积分数的增加,复合水凝胶非织造布的阻隔性增强且抗氧化活性显著提高;在18 d的释放行为测试中,复合水凝胶非织造布在酸性条件下SBT的最大累计释放率可达67.84%,对金黄色葡萄球菌和大肠杆菌的抑菌带宽度均超过1 mm,有较好的抗菌性能;添加体积分数为30% SBT的复合水凝胶非织造布综合保鲜能力最佳,可储存鲜切苹果时间最长达9 d。

Preparation and property of composite hydrogel nonwoven based fresh-keeping material

In order to expand the application of nonwovens as fresh-keeping packaging materials, using sea buckthorn as the raw material for antioxidant fresh-keeping ingredients, a composite hydrogel nonwovens fresh-keeping material was prepared by loading different volume fractions of sea buckthorn extract (SBT) to prepare apocynum nanofibers/chitosan based hydrogels and compounding with polyester nonwovens. The blocking effect, release behavior, antioxidant properties, antibacterial and fresh-keeping performance of the engineered material were analyzed. The results show that as SBT volume fraction increases, the blocking effect of the composite hydrogel nonwoven is enhanced and the oxidation resistance is significantly improved. In the 18 d release test, the maximum cumulative SBT release percentage from the fresh-keeping material under the acidic condition reaches 67.84%, and the width of the inhibition zone against Staphylococcus aureus and Escherichia coli is more than 1 mm, indicating good antibacterial performance. The composite hydrogel nonwoven with 30% SBT has the best comprehensive freshness preservation ability for 9 d.