茶氨酸的制取及应用

茶氨酸是茶叶中的一种主要氨基酸 ,通常占茶叶干重的 2 %左右 ,约占茶树体内游离氨基酸5 0 %。茶氨酸具有鲜甜味 ,是茶叶特征物质之一 ,与茶叶品质呈正相关。现已作为食品添加剂应用于食品领域。除此以外 ,茶氨酸还具有一些重要的药理作用。如抗肿瘤、降压安神、拮抗咖啡碱等医疗功效。本文综述了茶氨酸的性质、制取方法及应用前景等方面的内容。

THE PREPARATION AND APPLICATION OF THEANINE

Theanine is one of the main amino acid components in tea.It usually constitutes about 2% of the dryweight of tea leaves and occupies around 50% of the total free amino acids in tea plant with little or no aftertaste.Theanine is found to have a similar sweetness and is an exclusive amino acid of tea.Theanine has been known to play an important role in enhancing the quality of tea and is a characteristic of tea,which has been used as a kind of food additive.In addition,theanine has more significant pharmacological effects.For example,theanine not only has the function of antitumor reducing blood pressure and smoothing nerves but also inhibits the stimulation caused by caffeine and so on.This paper reports the respects of nature,preparation and application of the theanine.