不同发酵时间普洱茶的表面增强拉曼光谱鉴别分析

Identification of Pu'er Teas with Different Fermentation Time by Surface-enhanced Raman Scattering Technology

发现一种鉴定普洱茶不同发酵时间的快速、简便、科学的方法,通过利用激光共聚焦拉曼光谱仪,采用表面增强拉曼光谱技术(SERS),在600～1 800 cm-1波数段分析了4种发酵时间普洱茶标准品的SERS光谱异同点,发现在655,732,959,1 238 cm-1等较为明显的特征峰处存在着明显的差异。研究了普洱茶发酵过程中茶多酚、含氮化合物、有机酸和糖类物质的含量变化规律,通过SERS光谱分析,为鉴定普洱茶的品质提供了一种科学、简便、快捷的光学方法。

We demonstrate a fast,simple and scientific method to identify the Pu＇er teas with different fermentation time by using surface-enhanced Raman scattering（SERS） technology at range of 600～1800 cm-1.The results indicate that there exist many peaks at 655,732,959,1 238 cm-1.The realationship between fermentation time and the content of tea polyphenol,nitrogenous compounds,organic acid and sugar material in Pu＇er teas are discussed.This way can provide a fast,simple and scientific optical method to identify the Pu＇er teas with different fermentation time.