壳聚糖复合涂膜对蓝莓保鲜效果的影响

Effect of chitosan composite coating on preservation of blueberry

以‘北陆’蓝莓为试材,研究采用1%壳聚糖+0.5%抗坏血酸复配中草药提取物制成的可食用涂膜液处理对其在低温(0±0.2℃)贮藏过程中保鲜效果的影响.结果表明:壳聚糖复合涂膜处理能够减缓蓝莓果实贮藏期内硬度、可溶性固形物(total soluble solids,TSS)含量、可滴定酸(titritable acidity,TA)含量及含水量的下降,延缓丙二醛(malondialdehyde,MDA)含量上升,推迟呼吸高峰及乙烯高峰的出现时间,同时减缓VC及总酚含量的下降,有效地降低多酚氧化酶(polyphenol oxidase,PPO)的活性并抑制其活性高峰的出现,提高过氧化物酶(peroxidase,POD)和过氧化氢酶(catalase,CAT)的活性.表明壳聚糖复合涂膜处理能有效保持蓝莓果实的贮藏品质,延缓其成熟衰老进程,从而延长货架期.

The effect of 1%chitosan coating combined with 0.5%Vc and the Chinese herbal medicine extracts on the preservation of‘Beilu’blueberry during storage at low temperature(0±0.2℃)were studied.The results showed that,compared with the control,the chitosan composite coating treatment could slow down the decrease in firmness,soluble solids(TSS)content,titratable acid(TA)content and water content of the blueberry fruit during storage,delay the increase in malondialdehyde(MDA)content,postpone the peaks of respiration and ethylene production,simultiniously decelerate the decrease in Vc content and total phenols,effectively reduce the activity of polyphenol oxidase(PPO)and inhibit its activity peak,and promote the activities of peroxidase(POD)and catalase(CAT).Therefore,the chitosan composite coating treatment could effectively maintain the storage quality of the blueberry fruit,delay its ripening and senescence process,and thus extend the shelflife.