低温气调贮藏对’突尼斯’软籽石榴贮后货架期品质的影响

Effect of Cold Controlled Atmosphere Storage on Quality of’Tunisia’Soft Seed Pomegranate during Subsequent Shelf Life

为延长石榴贮藏期,维持低温贮后货架期品质,研究了经2%(体积分数,下同)O2+8%CO2、4%O2+7%CO2、5%O2+6%CO2和自然空气(对照)的低温(7.0±0.5)℃气调贮藏方式对’突尼斯’软籽石榴贮后货架期((20.0±0.5)℃)品质变化的影响。结果表明:与普通冷藏(对照)相比,经不同气体组合的低温气调贮藏有效地抑制了贮后货架期间石榴果实表皮褐变和果实质量损失,提高了假种皮(可食部分)可溶性固形物/可滴定酸比值,改善了贮后石榴风味。在贮后货架期4 d时,经不同气体组合低温气调贮藏的石榴,果皮总酚含量显著低于对照组(P<0.05),花色苷含量和多酚氧化酶活力与对照组相比有不同程度的提高;气体组合中O2/CO2比值越低,石榴假种皮总酚、花色苷含量以及抗氧化活性越高。其中,经2%O2+8%CO2气调贮藏的石榴在贮后货架期第4天,表皮褐变指数和质量损失率最低,假种皮总酚含量和抗氧化活性最高,为较适宜的气体组合方式。

In order to extend the storage period and maintain the quality of pomegranate during subsequent shelf life,the effects of cold((7.0±0.5)℃)controlled atmosphere storage with different gas combinations:2%O2+8%CO2,4%O2+7%CO2 and 5%O2+6%CO2 on the quality of’Tunisia’soft seed pomegranate during subsequent shelf life at(20.0±0.5)℃were investigated.The results showed that the cold controlled atmosphere storage could effectively inhibit the occurrence of scald husk and mass loss during subsequent shelf life in comparison with ordinary refrigeration(control).The controlled atmosphere storage also increased soluble solids/titratable acid ratio in the edible aril and improved the flavor of pomegranate.On the fourth day of shelf life,the total phenolics content of pomegranate peel stored in each modified atmosphere was lower than that of the control,while the anthocyanins content and polyphenol oxidase activity were increased to different degrees.The lower the oxygen/carbon dioxide ratio,the higher contents of anthocyanins and total phenols,and the antioxidant activity of pomegranate arils.Among these combinations,pomegranate arils stored in 2%O2+8%CO2 had highest total phenolics content and antioxidant activity,the lowest husk scald degree and mass loss percentage at 4 days of shelf life,so that this combination was the optimal one.