Study on Relative Contents of Principal Components of Different Tea by Infrared Absorption Spectroscopy
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 cm1 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-gaIlocatechin-3gallaet 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, epi-gallocatechin-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.
infrared absorption spectroscopy spectral reconstruction principal components of tea
Xiaohui Zhao Lian-shui Zhang Zhi-chu Nie Rong-xiang Zhang Xiao-wei Li
College of Physics Science and Technology, Hebei University Key Laboratory of Photo-Electricity Information Materials of Hebei Province Baoding, Hebei, China
国际会议
2011 International Conference on Electronics and Optoelectronics(2011电子学与光电子学国际会议 ICEOE 2011)
大连
英文
146-150
2011-07-29（万方平台首次上网日期，不代表论文的发表时间）