水溶性壳聚糖涂膜处理对采后绿芦笋贮藏品质的影响

研究了0.50%的水溶性壳聚糖(WSC)和羧甲基壳聚糖(CMC)分别对在2℃贮藏条件下采后绿芦笋的涂膜保鲜。通过感官品质、失重率、抗坏血酸含量、叶绿素含量、丙二醛(MDA)含量、总酚含量、多酚氧化酶(PPO)等生理生化指标的测定,以未经处理的绿芦笋为对照。结果表明:经0.50%的CMC和WSC进行涂膜处理,均可有效地降低芦笋的失重率,维持其硬度,延缓其抗坏血酸和叶绿素营养物质的消耗。而且CMC处理可以明显抑制绿芦笋总酚含量的下降及其PPO、POD和SOD活性的变化,其感官品质也明显优于对照组,使绿芦笋的贮藏时间延长至35 d。

Effect of water-soluble chitosan coatings on postharvest green asparagus quality

The quality of 0.50% water-soluble chitosan(WSC) and carboxymethyl chitosan(CMC) coatings on postharvest green asparagus which were stored at 2℃ was investigated.Base on the data of sensory evaluation,weight loss percentage,the contents of ascorbic acid,chlorophyll,malonaldehyde(MDA),total phenolic and polyphenoloxidase(PPO),peroxidase(POD),super oxygen dehydrogenises(SOD) activity testing,both 0.50% WSC and CMC treatments could dramatically retard the decrease of weight loss,firmness,the loss of chlorophyll and ascorbic acid during the storage.Moreover,0.50% CMC treatment not only could keep the total phenolics content,but restrain the changes of PPO,POD,and SOD activity,presenting better quality of asparagus than the control during the cold storage,and prolong the shelf life of postharvest green asparagus to 35 days.