不同气体成分贮藏对狗头枣鲜果生理变化与品质的影响

Effects of different gas composition storage on physiological changes and quality of Dog-head jujube fruit

研究不同气体成分贮藏对狗头枣生理变化与品质的影响,为狗头枣贮藏保鲜提供理论基础和技术方法。以陕西延安狗头枣为试材,研究了狗头枣的呼吸类型,探索了不同气体配比对狗头枣贮藏期间糖、酸、维生素C(V C)含量和主要酶活性的影响,并在贮后进行了感官鉴评。结果表明:狗头枣为非呼吸跃变型果实,10%O 2+90%N 2气体配比能减缓枣果实硬度和可滴定酸含量的下降速率,较好地保持还原糖和V C含量,抑制多聚半乳糖醛酸酶(PG)、过氧化物酶(POD)和多酚氧化酶(PPO)的活性,使过氧化氢酶(CAT)活性得到较好的维持。狗头枣鲜果在温度-1~0℃、相对湿度90%~95%、气体配比10%O 2+90%N 2的条件下贮藏80 d,好果率88.6%,鲜度指数0.59,贮后感官鉴评品质良好。

The effects of different gas composition storage on physiological changes and quality of Dog-head jujube fruit were studied.Shaanxi Yan an Dog-head jujube was selected as the material to investigate the respiration type,and the storage effect of different gas ratios on the content of sugar,acid,vitamin C(V C)and the activity of main enzymes.The sensory evaluation was carried out after the storage.Results showed that Dog-head jujube was non-climacteric fruit.The ratio of 10%O 2+90%N 2 gas could slow down the decreasing rate of fruit hardness and titratable acid content,maintain the content of reducing sugar and V C,inhibit the activities of polygalacturonase(PG),peroxidase(POD)and polyphenol oxidase(PPO),and enhance catalase(CAT)activity.The fresh fruit was stored under the condition of low temperature of-1~0℃,relative humidity of 90%~95%and gas ratio of 10%O 2+90%N 2 for 80 d.After storage,the good fruit rate was 88.6%,freshness index was 0.59,and sensory evaluation quality was good.