Abstract
Fourier transform infrared absorption (FTIR) spectroscopy has been used to study the relative contents of principal components of different tea. Middle infrared(MIR) spectra in the range of 400∼4000 cm−1 has been obtained, which included six kinds of brand tea, corresponding remains and four kinds of component molecular. Contents of components in different kind of tea have been obtained by a new method that made spectral reconstruction based on five principal component model, particularly the remains of tea considered as primary components, as well as anthocyanic, theanine, epi-gallocatechin-3-gallaet and caffeine. All the correlation coefficient between original spectra of tea and reconstructive spectra are beyond 99% in the range of 800–2000 cm−1. Meanwhile, the fitting results clearly showed that the relative contents and regularity of theanine, epigallocatechin-3-gallae and caffeine were consistent with the reported results in different kind of tea. Therefore, it was confirmed that this new method can be used to identify tea samples effectively.
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