壳聚糖复合涂膜对鲜切冬枣安全性与贮藏品质的影响

以残次冬枣为实验材料，通过正交试验，以VC 的损失为指标确定了一种新型壳聚糖复合涂膜剂。结果表明：复合涂膜剂的最佳配方为1.0% 壳聚糖+1% 柠檬酸+2% 乳清蛋白+0.3% CaCl2。经该复合涂膜剂处理后的冬枣，在2℃下的贮藏品质明显提高。结果显示涂膜处理显著抑制了贮藏中微生物(细菌、霉菌及酵母、大肠杆菌)数量的上升(p ＜ 0.05)，从而在一定程度上防止了微生物腐败的发生；降低了冬枣中营养物质的降解和转化，总糖及可溶性蛋白含量均被显著降低。此外抗氧化酶(CAT、POD、SOD)活性的检测结果也在一定程度上证明了复合涂膜处理对于冬枣品质的保护作用。

Effects of Chitosan-based Coating on Safety and Storage Quality of Fresh-cut Chinese Winter Jujube

A novel chitosan-based coating was developed through orthogonal test with inferior Chinese winter jujube used as experimental material and loss of vitamin C as a indicator. The results showed that the best formula of coating is 1.5% of chitosan, 1% of citric acid, 2% of whey protein and 0.3% of CaCl2. The quality of fresh-cut winter jujube is improved significantly by chitosan-based coating treatment, which is stored at 2 ℃. The coating can strongly inhibit the numbers of total bacteria, yeast, mold and E.coli, prevent microbial contamination, reduce the degradation and transformation of nutrients, and decrease the content of total sugar and soluble protein. The activities of some antioxidant enzymes (CAT, POD and SOD) also indicated that the treatment of chitosan-based coating can prevent the quality degradation of fresh-cut Chinese winter jujube.