Chemical Constituents of Pu-erh Tea and Its Inhibition Effect on α-amylase in vitro  

普洱茶化学成分及体外对α-淀粉酶抑制作用(摘要)(英文)

作　　者：张冬英[1,2] 邵宛芳[1] 刘仲华[2] 黄业伟[1] 施兆鹏[2] 

机构地区：[1]云南农业大学龙润普洱茶学院,云南昆明650201 [2]湖南农业大学教育部茶学重点实验室,湖南长沙410128

出　　处：《Agricultural Science & Technology》2010年第1期130-132,共3页农业科学与技术（英文版）

基　　金：Supported by National Science and Technology Support Project(2007BAD58B04 );Special Fund Project of Modern Agriculture(Tea) Industrial Technology System;Yunnan Department of Education and Scientific Research Fund (07Y40163)~~

摘　　要：[Objective]The aim was to clarify the chemical substance basis of hypoglycemic and lipid-lowering effects of Pu-erh Tea. [Method]Pu-erh Tea was extracted with 95% ethanol,followed by petroleum ether,chloroform,ethyl acetate and n-butanol extraction,after the further purification and through the NKA-9 macroporous resin and many times of Sephadex column chromatography,two compounds were isolated,in the same time,the effect of Uracil and Gallic acid on α-amylase was studied. [Result]The Uracil and Gallic acid were isolated and identified respectively from Pu-erh Tea and the Uracil was firstly isolated from Pu-erh Tea; Gallic acid had strong inhibition on α-amylase. [Conclusion]It could provide some theories on the hypoglycemic and lipid-lowering effects of Pu-erh Tea.[目的]研究普洱茶中的降糖降脂活性成分,以阐明其活性作用的物质基础,并可为药物的开发提供一条新的思路。[方法]以降糖降脂活性为检测指标,对普洱茶的活性成分进行追踪分离。先用95%乙醇对普洱茶进行浸提,再依次用石油醚、氯仿、乙酸乙酯、正丁醇萃取,大孔树脂、葡聚糖凝胶等多次柱层析分离,以反相高效液相梯度洗脱法为检测手段,对普洱茶的活性成分进行分离纯化,最终得到2个单体化合物V-1、V-2。在高效液相色谱确定化合物的纯度后,结合其理化性质,利用紫外光谱、红外光谱、核磁共振、质谱等波谱分析,鉴定其化学结构。同时,研究了它们对α-淀粉酶的影响。[结果]化合物V-1:C4H4N2O2,白色无定形粉末,mp>300℃(温度未经校正);MS(APCI源负离子图谱):分子量112;IR光谱进行谱库检索对照,与尿嘧啶的光谱数据完全相同;最终确定该化合物为尿嘧啶(Uracil,U)。化合物V-2:C7H6O5,淡黄色粉末,mp:239～242℃,微溶于冷水,溶于热水、乙醇、丙酮及甘油;MS(APCI源负离子图谱):分子量170;IR光谱进行谱库检索对照,与没食子酸的光谱数据完全相同,与标准品没食子酸共薄层,其Rf值一致,与标准品没食子酸混合,其熔点不下降;最终确定该化合物为没食子酸(Gallic acid,GA)。2个单体化合物没食子酸和尿嘧啶对α-淀粉酶抑制作用的影响表明,没食子酸比尿嘧啶的抑制作用强,在浓度为10mg/ml时其抑制率达63.76%,与分离纯化组分(SII-1)对α-淀粉酶的抑制效果相当(66.21%)。[结论]研究在对普洱茶活性成分分离中首次得到尿嘧啶。

关 键 词：Pu-erh Tea URACIL Gallic acid Α-AMYLASE INHIBITION 

分 类 号：S571.1[农业科学—茶叶生产加工]