普洱茶的傅里叶变换红外光谱鉴别研究

利用傅里叶变换红外光谱法研究了云南省思茅地区所产不同等级的普洱生茶和熟茶。结果显示:生普和熟普的红外光谱虽然整体上十分相似,但由于生普和熟普的生产工艺不同,其化学成分的组成比例也各异,因而生普和熟普均具有其各自的特征红外光谱,且不同品质的生普和不同品质的熟普之间,其红外光谱均有明显的差异。根据红外光谱的特征峰形和吸光度比不仅可以区分生普和熟普,而且有可能区分生普或熟普的不同品质级别。傅里叶红外光谱法快速、简便、直观且样品不需要分离提取,适用于普洱茶的级别鉴别。

Identification of Pu'er Tea by Fourier Transform Infrared Spectroscopy

In the present paper,Fourier transform infrared spectroscopy(FTIR) was used to determine unzymic and zymic Pu'er tea of different grade produced in Simao,Yunan Province.Because of the different processing technology,different proportion of chemical constituents exists in the unzymic and zymic Pu'er tea.And although there is a great mass of similarity in infrared spectrum,the results still show differences in the characteristic peaks of infrared spectrum between unzymic and zymic Pu'er tee.And there is also obvious difference between unzymic Pu'er tea of different grade or zymic Pu'er tea of different grade.According to the studies of the spectral peaks and absorbance ratios,unzymic and zymic Pu'er tea can easily be identified.And different grade of unzymic and zymic Pu'er tea may be classified by the differences in the absorbance ratios of several peaks.FTIR is proved to be a rapid,simple,reliable and non-destructive qualification method,it is suitable for grade identification of Pu'er tea.