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 600～1 800 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.