贮藏温度对百香果果皮性状及其活性氧代谢的影响

Effects of storage temperature on the characters and reactive oxygen metabolism of peel of Passiflora edulis Sims

目的探讨贮藏温度对采后百香果果皮性状及其活性氧代谢的影响。方法以金福7号百香果为试材,通过测定贮藏过程中失重率、果皮色度值、果皮中的一些活性氧代谢指标的变化规律,来探究贮藏温度对百香果果皮理化性质的影响。结果同常温相比,低温条件下百香果失重率相对较低,而且失重速率较小。低温贮藏能有效维持百香果的L^(*),低温下的a^(*)相对较低,且a^(*)正值出现的时间也较晚,对b^(*)影响不大。低温在一定时间内不仅可以减缓超氧阴离子自由基(superoxide anion,O_(2)^(-)·)产生速率的变化,而且还可以保持相对较高的抗氧化性。结论低温下百香果果皮水分含量和色泽表现良好,一定时间内其果皮的抗氧化活性较高。结合相关性分析结果得出,在贮藏的过程中尤其冷藏时如果注意采取适当的保水措施,并使百香果果皮保持较高的超氧化物歧化酶(superoxide dismutase,SOD)和过氧化物酶(peroxidase,POD)活性,可以延长其贮藏期并使其保持较好外观品质。

Objective To explore the effects of storage temperature on the characters and reactive oxygen metabolism of peel of postharvest Passiflora edulis Sims.Methods The Passiflora edulis Sims cultivar named‘Jinfu No.7’was used as the test material,the effects of storage temperature on the physicochemical properties of Passiflora edulis Sims peel were investigated by measuring the changes of weight loss rate,peel color value and some active oxygen metabolism indexes in peel during storage.Results Compared with room temperature,the weight loss rate of Passiflora edulis Sims was relatively lower under cold conditions,and the weight loss rate was smaller.Cold storage could effectively maintain the L^(*)of Passiflora edulis Sims,and a^(*)at low temperature was relatively lower,and the positive value of a^(*)appeared late,but had little effect on b^(*).Low temperature could not only slow down the rate of superoxide anion(O_(2)^(-)·)production within a certain period of time,but also maintain relatively high antioxidant activity.Conclusion The moisture content and color of peel of Passiflora edulis Sims perform well at low temperatures,and the antioxidant activity of the peel is relatively high within a certain period of time.Combined with the results of correlation analysis,it is concluded that if appropriate water retention measures are taken during storage,especially during cold storage,and the peel of Passiflora edulis Sims maintains high activities of superoxide dismutase(SOD)and peroxidase(POD),the storage period can be prolonged and the appearance quality can be maintained.