傅立叶红外光谱法用于茶叶品质的鉴定

为了实现茶叶品质的快速准确鉴别，以常用的4种茶叶（花茶、绿茶、普洱茶、乌龙茶）为研究对象，每种茶叶按特级、普通、低档3个档次各选一个实验样品，测定了它们的傅立叶红外光谱图．结果表明：同类茶叶在3000—2800cm^-1、1700—1500cm^-1、1500—1200cm^-1、1200—1000cm^-1，900--400cm^-1区域有固定的特征谱带，茶叶品质的差异导致这些特征谱带出现波数、强度、形状的明显差异，为茶叶品质的鉴别提供了较可靠的依据．

Discrimination of Tea Quality by FTIR Spectroscopy

To discriminate tea quality quickly and accurately, a new method of FTIR spectroscopy is proL posed. 4 kinds of tea （ Scented tea, Green tea, PU ER tea and Oolong tea） are chosen, for each kind of tea 3 different quality grades （high, common, low） are sampled to analyze by FFIR technique. The results show that all samples have relatively stable spectrum regions of 3000-2800,1700-1500,1500-1200,1200-1000, and 900--400cm^-1, but the spectra of different quantities of tea give obvious difference in wave numbers, in- tensity and shapes. It is concluded that FTIR is a feasible way to discriminate tea quality.