臭氧与海藻酸钠涂膜对葡萄的保鲜效果及其贮藏生理特性的影响

Effect of Ozone Treatment with and without Sodium Alginate Coatings on Preservation and Resistance Index of Grape Fruits

以采后"红地球"葡萄果实为试材,分别设置对照(CK)、250μL/L臭氧处理(O3)、0.3%海藻酸钠涂膜处理(M)、250μL/L臭氧+0.3%海藻酸钠涂膜处理(O3+M),在(0±0.5)℃条件下贮藏,通过测定贮藏过程中葡萄可溶性固形物含量、可滴定酸含量、呼吸强度、硬度、过氧化物酶(POD)、超氧化物歧化酶(SOD)、几丁质酶(CHI)、β-1,3-葡聚糖酶(GLU)的活性以及膜脂过氧化物质丙二醛(MDA)和总酚含量等的变化,统计果实失重率与腐烂率情况,观察各处理对葡萄保藏效果的影响。结果表明:与对照相比,250μL/L臭氧处理、0.3%海藻酸钠涂膜及250μL/L臭氧+0.3%海藻酸钠涂膜复合处理均能显著降低葡萄果实的失重率和腐烂率,抑制葡萄果实的呼吸上升,延缓硬度下降,提高果实抗性相关酶(POD、SOD、GLU、CHI)的活性,减少膜脂的过氧化程度,延缓果实总酚含量下降,有效改善葡萄的贮藏品质,并以250μL/L臭氧+0.3%海藻酸钠涂膜复合处理对葡萄果实保鲜效果最佳。

Using postharvest＂Red global＂grapes as the material,we investigated the effect of four different treatments of control,250μL/L ozone,0.3% coatings and the combination of 250μL/L ozone and 0.3%coatings on the storage property of grapes,Through the determination of the soluble solids,titratable acid,respiration intensity,hardness,peroxidase（POD）,superoxide dismutase（SOD）,β-l,3-glucanase（GLU）,chitinase（CHI）,malondialdehyde（MDA）,total phenol,statistical weight loss and decay.The results showed that the weight loss rate and rot rate of 250μL/L ozone,0.3% coatings and the combination of250μL/L ozone and 0.3% coatings was reduced,the activities of POD,SOD,CHI,GLU was promoted,MDA content was decreased and the drop of the total phenol was delayed compared with control group.In conclusion,the combination of 250μL/L ozone and 0.3% sodium alginate coatings had the best result.