含茶多酚的壳聚糖涂膜对四季豆贮藏品质和生理生化特性的影响

摘要

ABSTRACT:Objective To explore the feasibility of using preservative coating mixed with tea polyphenols for fresh-keeping of Phaseolus vulgaris L. (PV). Methods In order to study the effect of tea polyphenol on storage quality and physio-biochemistry characteristics of PV, two different storage methods were selected, one was chitosan coating (coating concentration:1.5%), another was tea polyphenol-incorporated chitosan coating (1.5% soluble chitosan blended with 150 mg/kg tea polyphenol). Results PV coated with 1.5% soluble chitosan blended with 150 mg/kg tea polyphenol had better storage qualities. The decline rate of vitamin C, chlorophyll, water content and the rise rate of cellulose content were lower than those of the group coated only with chitosan. Meanwhile, the activities of peroxidase (POD), superoxide dismutase (SOD), and catalase (CAT) were lower in PV coated with tea polyphenol-incorporated chitosan coating than that coated only with chitosan. However, the 2 groups were all higher than that without coating. Conclusion It was found that coating has a help for storage of PV, tea polyphenol-incorporated chitosan coating had a better effect which could extend the shelf life of PV. for 10 d compared with the group coated only with chitosan, and 20 d compared with the group without coating.%目的：研究壳聚糖联合茶多酚对四季豆涂膜保鲜的可行性。方法以四季豆为实验材料,采用壳聚糖涂膜(浓度为1.5%)、壳聚糖联合茶多酚复合涂膜(1.5%壳聚糖中添加150 mg/kg茶多酚)2种保鲜方式,研究茶多酚对四季豆贮藏品质和生理生化特性的影响。结果茶多酚联合壳聚糖涂膜的四季豆在贮藏期内叶绿素、维生素C、水分含量的下降速率和纤维素含量的上升速率均低于壳聚糖涂膜组,贮藏品质较好。茶多酚联合壳聚糖涂膜的四季豆体内的过氧化物酶(POD)、超氧化物歧化酶(SOD)、过氧化氢酶(CAT)的活力低于壳聚糖涂膜组,但二者均高于未处理组。结论涂膜处理有利于四季豆的贮藏,涂膜剂中加入茶多酚后保鲜效果更好,和壳聚糖涂膜相比可将四季豆贮藏期延长10 d,和不涂膜组相比可延长20 d。