Using trifluoroacetic acid and acetonitrile as the mobile phase,underivatized L-theanine in six categories of tea extracts were analyzed by HPLC-PDAD.

• 以0.；05%25三氟乙酸和50%25乙腈为流动相；应用HPLC-PDAD建立了茶叶中未衍生化L-茶氨酸的分析方法。