黄连壳聚糖复合涂膜保鲜剂对夏橙保鲜效果的研究

为明确可食性涂膜保鲜剂取代常规处理保鲜柑橘的可能性，研究黄连淀粉壳聚糖复合涂膜剂对奥林达夏橙(Citrus sinensis (L.) cv. Olinda Valencia orange)保鲜的效果。结果表明：复合涂膜可以明显降低贮藏期间夏橙病害指数和质量损失率，保持较高的好果率；复合涂膜处理可以降低果实的呼吸强度，维持果实内部较高的可滴定酸和VC含量，可溶性固形物含量变化较小，保持果实较高的营养品质；复合涂膜可以提高果实中过氧化氢酶活性，且在贮藏后期过氧化氢酶活性和超氧化物歧化酶活性明显高于常规方法处理，有效抑制丙二醛的积累，保持细胞膜的完整性。以上研究表明复合涂膜在延缓夏橙贮藏期间果实品质劣变和衰老方面已达到常规处理的保鲜效果，且食用安全、环境友好，具有替代夏橙果实常规保鲜的潜在应用价值。

Effect of Coptis chinensis Franch-Chitosan Film on Preservation of Valencia Orange Fruits

In order to clarify the possibility of edible film as a substitute for traditional preservatives,the fresh-keeping effect of Coptis chinensis Franch(50% ethanol extract from Rhizoma Coptis)-chitosan film on Citrus sinensis(L.) cv.Olinda Valencia orange fruits was investigated.The results showed that the composite coating could significantly decrease disease index and weight loss rate as well as decay fruit rate.Meanwhile,it could also decrease respiration intensity,maintain higher contents of titratable acids and vitamin C and stabilize the content of soluble solids.In addition,the composite coating could enhance the activity of catalase(CAT) in valencia orange fruits.Moreover,compared with the traditional preservation treatment,this coating could maintain higher activities of CAT and SOD in orange fruits during the late stage of storage,consequently inhibiting the accumulation of malondialdehyde(MDA) and maintaining cell membrane integrity.Therefore,this coating not only has similar effect to the traditional preservative in maintaining fruit quality and delaying quality senescence,but also possesses edible safety and environment-friendly characteristics,suggesting its promising application potential as a substitute for traditional preservatives.