壳聚糖处理延缓采后菜豆豆荚纤维化的研究

摘要

以菜豆豆荚为供试材料,探讨1、5和10g/L壳聚糖涂膜处理对采后菜豆豆荚纤维化的影响。结果表明：壳聚糖涂膜处理能减缓采后菜豆豆荚切割力的增加速度,抑制粗纤维的合成进程。贮藏至第8天,经10g/L壳聚糖处理的菜豆豆荚其切割力比对照组低12.5%,粗纤维质量分数比对照组低7.4%,这是因为壳聚糖涂膜处理能抑制豆荚过氧化物酶（POD）、多酚氧化酶（PPO）和苯丙氨酸解氨酶（PAL）活性的增加,从而延缓豆荚纤维化进程。贮藏至第8天,10g/L壳聚糖涂膜处理的豆荚POD、PPO和PAL活性分别比对照组低21.8%、80.0%和31.8%。壳聚糖涂膜处理效果比较表明,10g/L壳聚糖涂膜处理延缓纤维化进程的效果最显著。%To explore the effects of chitosan coating treatment on pods fibrosis of postharvest beans,the common bean pods were dipped into the chitosan solutions of 1,5 and 10 g/L,respectively.The results indicated that the increase of cutting velocity for crude fibre were inhibited when the common bean pods were treated with chitosan.After eight days storage,the cutting force and the fiber content of the common bean pots with chitosan treatment was 12.5% and 7.4%,respectively,which were both lower than the controls.The reason was that the activity increases of peroxidase（POD）,polyphenol（PPO） and phenylalanin ammonialyase（PAL） were inhibited in the chitosan treated pods of common beans,which delays the process of fibre synthesis of common bean pods.After eight days storage,the activities of peroxidase（POD）,polyphenol（PPO） and phenylalanin ammonialyase（PAL） in the common bean pots treated with 10 g/L chitosan was 21.8%,80.0% and 31.8%,respectively,which were lower than those without chitosan treatment.The results showed that the application of 10 g/L chitasan treatment was more effective than other treatments.