食品科学 ›› 2008, Vol. 29 ›› Issue (4): 335-337.

• 分析检测 • 上一篇    下一篇

不同茶叶中茶氨酸含量的测定比较

 张健, 荣绍丰, 龚钢明, 邱子春   

  1. 上海应用技术学院香料香精技术与工程学院; 上海应用技术学院香料香精技术与工程学院;
  • 出版日期:2008-04-15 发布日期:2011-08-24

Comparison of Determination of Theanine in Different Tea Species

 ZHANG  Jian, RONG  Shao-Feng, GONG  Gang-Ming, QIU  Zi-Chun   

  1. School of Perfume and Aroma Technology, Shanghai Institute of Technology
  • Online:2008-04-15 Published:2011-08-24

摘要: 建立用高效液相色谱法测定茶叶中茶氨酸的方法,用于比较红茶、绿茶、甜茶等各种茶叶中茶氨酸的含量。采用的色谱柱为C18色谱柱,以甲醇和0.05%体积分数的三氟乙酸溶液为流动相进行梯度洗脱。流速为0.8ml/min,紫外检测波长为208nm,柱温30℃,外标法定量。结果表明,在一定浓度的茶氨酸浓度范围内,峰面积与质量浓度具有良好的线性关系,以茶氨酸浓度为横坐标,建立线性回归方程Y=4299.366X+14.828,相关系数R为0.9997。通过对各种茶叶的测定,比较其中含有的茶氨酸的量。茶氨酸的加样回收率为101.06%,对各种茶叶方法精密度相对标准偏差均小于为0.5%,该操作方法简便、快速、准确。测定发现红茶、绿茶、甜茶等各种类型的茶叶中茶氨酸的含量与茶叶类别有关。

关键词: 茶氨酸, 茶叶, 高效液相色谱法

Abstract: High performance liquid chromatography (HPLC) was used for the determination of theanine in different tea species. Theanine can be separated on a Eclipse XDB-C18 column with trifluoroacetic acid (0.05%) as solution and methanol as mobile phase for gradient elution. The UV detection wavelength is set at 208 nm, the flow rate 0.8 ml/min. and the temperature of column 30 ℃. Under the conditions mentioned above, the relative peak area(Y) is linearly related with the concentration(X) of theanine and its linear regression equation is Y=4299.3 66X+14.828, R2=0.9997. The average recovery is 101.06%.The RSD is <0.5%. The method is simple and accurate, and can be used in determination of the black tea, green tea, sweet tea and most of the tea species.

Key words: theanine, tea, high performance liquid chromatography