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Purification, characterization and inactivation kinetics of polyphenol oxidase extracted from Cistanche deserticola

文献类型： 外文期刊

作者： Huang, Jin 1 ; Gao, Xiaoguang 1 ; Su, Lingling 1 ; Liu, Xueqiang 1 ; Guo, Limin 2 ; Zhang, Zhentao 3 ; Zhao, Dandan 1 ; Hao, Jianxiong 1 ;

作者机构： 1.Hebei Univ Sci & Technol, Coll Food Sci & Biol, Shijiazhuang 050000, Peoples R China

2.Xinjiang Acad Agr Sci, Inst Agroprod Storage & Proc, Urumqi 830091, Peoples R China

3.Tech Inst Phys & Chem CAS, Beijing 100190, Peoples R China

关键词： Cistanche deserticola; Polyphenol oxidase; Purification; Enzymatic properties; Inactivation of enzyme

期刊名称：PLANTA （ 影响因子：4.3； 五年影响因子：4.8 ）

ISSN： 0032-0935

年卷期： 2023 年 257 卷 5 期

页码：

收录情况： SCI

摘要： Main conclusion PPO was purified from Cistanche deserticola, and its enzymatic characteristics were clarified. It was found that microwave treatment was an efficient way to inactivate PPO. Polyphenol oxidase (PPO) from Cistanche deserticola was obtained and purified through an acetone precipitation and anion exchange column, the enzymatic characteristics and inactivation kinetics of PPO were studied. The specific activity of PPO was 73135.15 +/- 6625.7 U/mg after purification, the purification multiple was 48.91 +/- 4.43 times, and the recovery was 30.96 +/- 0.27%. The molecular weight of the PPO component is about 66 kDa by SDS-PAGE analysis. The optimum substrate of PPO was catechol (Vmax = 0.048 U/mL, Km = 21.70 mM) and the optimum temperature and pH were 30 degrees C and 7, respectively. When the temperature is above 50 degrees C, pH < 3 or pH > 10, the enzyme activity can be significantly inhibited. The first-order kinetic fitting shows that microwave inactivation has lesser k values, larger D values and shorter t(1/2). It was found that microwave treatment is considered as an efficient and feasible way to inactive PPO by comparing the Z values and Ea values of the two thermal treatments.

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