关键词: 紫果猕猴桃, 多酚氧化酶活性, 总酚含量

Abstract: Using the twigs and petioles of Actinidia arguta var. purpurea as test materials, the polyphenol oxidase (PPO), total phenol content, and their change pattern were analyzed. The results showed that, the suitable pH value for determining A. arguta var. purpurea PPO activity was 7.0, the optimal substrate was oxophenic acid, with the concent of 0.16 mol/L, and the optimum temperature was 25 ℃. The PPO activity of A. arguta var. purpurea at growth phase was higher than at dormancy stage. The total phenol content of A. arguta var. purpurea was the minimum in April, May and September.

Key words: Actinidia arguta var. purpurea, polyphenol oxidase activity, total phenol content