Study On The Ethanol Accumulation And Active Oxygen Metabolism Of Jujube Fruits Under Hypobaric Condition

The post-harvest ethanol accumulation and physiology of active oxygen metabolism of Lizao and Dongzao under hypobaric condition were studied. The results showed that the incidence of anaerobic respiration arose the browning, the softening, accumulation of MDA content and increase of relative conductivity. The increase of oxidative enzyme AAO activity and PPO activity were inhibited under hypobaric condition. The ethanol was diffused quickly in the hypobaric storage. The ethanol content increased slowly during the early stage of storage, but it increased rapidly during the late stage of storage. The ethanol content positively correlated with AAO activity,PPO activity,MDA content and relative conductivity significantly. The study also showed that the accumulation of active oxygen were inhibited and the senescence of jujube fruit were slow down under hypobaric condition. O 2? content increased slowly. The curve of POD activity showed two peaks. The curve of CAT activity showed some undulations. The curve of VC content increased in the early stage of the storage and decreased in the middle and late stage of the storage. O 2? content positively correlated with POD activity and VC contend during the early stage of storage, but it negatively correlated with POD activity, CAT activity and VC content. It were the accumulation of active oxygen that lead to the senescence of jujube fruit during the late stage of the storage. Under hypobaric condition, the decrease of VC content and fresh rate , the increase of browning rate and softening rate were all inhibited. So the hypobaric storage had better storage effect than the cold storage.