不同月份采摘的绿茶中茶多酚含量及其营养学意义

The polyphenols content of green tea samples collected in different months and its nutrition significance

目的:为了解不同月份采摘的绿茶中茶多酚含量及其营养学意义,开展了本项研究。方法:新鲜茶叶样品采自江西省婺源县大樟山茶场的5个不同种植区,茶叶采摘时间分别为2000年8月、2001年3月、4月和5月。按常规炮制方法处理,制成绿茶。分析测定了其中9种茶多酚类化合物,以及没食子酸及其衍生物和黄酮醇类化合物。结果:4月份采收的绿茶中茶多酚类化合物总量最高、占绿茶总重量的32.3%,是3月份采摘的绿茶所含茶多酚类化合物总量的1.41倍、5月份的1.34倍、8月份的2.45倍,绿茶中茶多酚类化合物总量的排列顺序为4月>5月>3月>8月。其中绿茶中所含的功能因子,茶多酚类化合物中含量最高的主成分———表没食子儿茶素没食子酸酯(EGCG)的含量顺序同样是4月>5月>3月>8月。结论:不同采摘期绿茶中具有代表性的生物活性物质———茶多酚含量存在较大差异。

Objective：The aim of this study is investigating the content of biological active materials（tea polyphenols） of green tea collected in different time and discussing about nutritional significance. Methods：AU samples were collected from 5 different areas of Dazhangshan tea farm of Wuyuan county of Jiangxi province. The collecting time was in August 2000, March 2001, April 2001, May 2001 respectively. Green tea was processed according to the ordinary procedures. The biological active materials were determined, including nine kinds of tea polyphenol compounds （Catechin, EC, GC, EGC, EGCG, ECG, GCG, ProcyanidinsB2. ProcyanidinsB3 ）, flavonols, gallic acid and derivants of gallic acid. Results：The highest total amount of tea polyphenols was found in green tea collected in April, the amount is about 32.3% of weight of green tea. It is 1.14 times of tea collected in March, 1. 34 times of tea collected in May, 2.45 times of tea collected in August. The sequence of total tea polyphenol contents in green tea is April 〉 May 〉 March 〉 August. The content of main functional factor EGCG of green tea also was showed the same tendency. Conclusion：The tea polyphenols content has obviously difference among 5 green tea samples which collected in different months.