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余甘子果实多酚氧化酶活性影响因素研究
作者:郑丽平,丘春秀(等) 来源:《湖北农业科学》2014年第07期
摘要:多酚氧化酶(PPO)是酶促褐变的关键酶,以余甘子(Phyllanthus emblica)果实PPO为研究对象,采用分光光度法研究余甘子果实PPO作用的最适底物,同时探究反应体系pH、反应温度、底物浓度、抑制剂对余甘子果实中PPO活性的影响。结果表明,余甘子果实PPO作用的最佳底物为焦性没食子酸,最适pH为6.0,最适反应温度为10 ℃,底物最佳浓度为0.14 mol/L,抗坏血酸(VC)、柠檬酸、亚硫酸钠、L-半胱氨酸4种抑制剂对余甘子果实PPO活性均表现出不同程度的抑制作用,其中抗坏血酸对余甘子果实PPO活性抑制效果最好。
关键词:余甘子(Phyllanthus emblica);多酚氧化酶(PPO);活性;抑制剂
中图分类号:R284.1;Q946.5 文献标识码:A 文章编号:0439-8114(2014)07-1621-04 Factors Affecting Activities of Polyphenol Oxidase in Phyllanthus emblica
ZHENG Li-ping,QIU Chun-xiu,CHEN Xiao-hong,WANG Hui-min,ZHANG Fu-ping (Department of Biology, Hanshan Normal University, Chaozhou 521041, Guangdong,China)
Abstract: Polyphenol oxidase(PPO) was the key enzyme of enzymatic browning. The optimal substrate to PPO of Phyllanthus emblica and effects of pH,temperature,concentration of substrate and inhibitor on PPO activity were studied with spectrophotometry. The results showed that the optimal substrate was pyrogallic acid. The optimal pH, temperature and concentration of substrate were 6.0, 10 ℃ and 0.14 mol/L, respectively. Vitamin C, citric acid, Na2SO3 and L-Cysteine had inhibition effects on PPO activity in different degree. Vitamin C had the best inhibition effect on PPO activity in the fruit of phyllanthus emblica.
Key words: Phyllanthus emblica; polyphenol oxidase(PPO); activity; inhibitor 余甘子(Phyllanthus emblica)属大戟科(Euphorbiaceae)叶下珠属植物,其果鲜食酸甜酥脆而微涩,初食味酸涩,良久乃甘,故名“余甘子”。余甘子树耐旱耐瘠,适应性强,喜光喜温,一般树高1~3 m,单果重15 g左右。研究表明,余甘子果实中含有丰富的超氧化物歧化酶、维生素C、多酚类物质及多糖等活性物质[1]。余甘子果实味酸微涩,清热凉血,消食健脾,生津止渴。主治血热血瘀、消化不良、腹胀、咳嗽、喉痛、口干及维生素C缺乏症。在藏药中,余甘子主治培根病、赤巴病、血病、高血压病等[2]。近年研究结果表明,余甘子具有抗炎、抗氧化、抗衰老、保肝等作用[3],而其强烈的抗氧化活性是其生理功能的基础[4]。果

