壳聚糖-山梨酸复合涂膜对宣城圆枣保鲜效果的影响

Impacts of Chitosan-Sorbic Acid Composite Coating on the Preservation Effects of Xuancheng Jujube Fruits

针对鲜食红枣成熟后贮藏期短,商品性会随贮藏期延长而降低等问题,以宣城圆枣为试材,采用5个浓度(0.1%、0.25%、0.5%、1.0%、1.5%)壳聚糖与浓度为0.1%的山梨酸混合,配制成复合保鲜液,对其进行涂膜保鲜处理。结果表明:在4℃条件下,壳聚糖-山梨酸复合涂膜处理在一定程度上能延缓宣城圆枣果实失重率与腐烂率上升的速度,同时抑制硬度及VC含量的下降,从而延缓果实的成熟衰老进程,提高贮藏品质,延长货架期。通过对各项果实品质指标数据的综合分析得出,复合涂膜溶液的最佳使用浓度为0.25%壳聚糖+0.1%山梨酸。

The present study focused on solving the problems including short storage period of mature fresh-eaten jujube fruits and decreased commodity qualities with the extension of storage period, thus the Xuancheng jujube fruits were used as test materials and five chitosan concentrations(0.1%, 0.25%, 0.5%, 1.0%, 1.5%) were employed to prepare compound preservative solutions with 0.1% sorbic acid. Results showed that the chitosan-sorbic acid composite coating treatment could delay the increase of weight loss rates and decay rates of jujube fruits under 4 ℃ storage, and suppress the reduction of firmness and VC contents, thereby inhibiting the mature senescence process of fruits, improving the storage qualities and prolonging the shelf life. Besides, the comprehensive analysis of fruits qualities indices demonstrated that composite coating solution prepared by 0.25%chitosan and 0.1% sorbic acid presented superior preservation effects.