壳聚糖-植酸复合涂膜对黄岩蜜橘保鲜效果的影响

目的探究壳聚糖和植酸涂膜对黄岩蜜橘保鲜效果的影响。方法采用壳聚糖(质量分数为1%)、植酸(质量分数为1%)和壳聚糖植酸(质量分数为1%)复合涂膜处理黄岩蜜橘,研究其贮藏期腐烂率、质量损失率、可溶性固形物含量、可滴定酸含量、过氧化物酶POD活性、多酚氧化酶PPO活性、MDA含量、呼吸强度、霉菌、酵母的变化情况。结果在贮藏期间,壳聚糖-植酸复合涂膜表现出较好的保鲜效果,在贮藏30 d时复合涂膜的腐烂率为5.7%,仅是对照组的30.0%;质量损失率为3.3%,是对照组的38.0%。复合涂膜相较于单一涂膜更好地延缓了贮藏期间黄岩蜜桔可溶性固形物含量和可滴定酸含量的变化速率,使黄岩蜜桔维持了较好的POD和PPO活性,减缓了霉菌、酵母等微生物的侵染进程,减少了果实中MDA的积累。结论壳聚糖-植酸复合涂膜在黄岩蜜橘表面形成了一层保护膜,较好地维持了其贮藏期的品质,延缓了其衰老进程,效果优于壳聚糖或植酸单一涂膜处理。

Effects of Chitosan and Phytic Acid Composite Film on Preservation of HuangYan Mandarin

The work aims to explore the effects of chitosan and phyticacid composite film on preservation of HuangYan mandarin. The HuangYan mandarin was coated with 1% chitosan,1% phytic acid and 1% chitosan and phytic acid composite film, respectively. Then, the changes of decay rate, weight loss, soluble solids content, titratable acidity content, POD, PPO, MDA content, respiratory intensity, molds and yeasts during storage were analyzed. The chitosan and phytic acid composite film had better preservation effect during storage. After 30 days, decay rate of HuangYan mandarin with composite film was 5.7%, which was only 30.0% of the control group, while the weight loss rate was 3.3%, which was 38.0% of the control group. Compared with the single film, the composite film could postpone the change of soluble solids content and titratable acidity of HuangYan mandarin during storage, maintain the activities of enzymes such as POD and PPO and delay the infection process of microorganisms such as mold and yeast. Meanwhile, it could reduce the accumulation of MDA in fruits. The chitosan and phytic acid composite film can form a protective film on the surface of HuangYan mandarin, which maintains better quality during storage and delays the senescence process. The HuangYan mandarin treated with composite film has better preservation effects than that treated by single chitosan or phytic acid.