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- W2377970070 abstract "For developing a method to identify green tea( GT),black tea( BT) and ripened Pu-erh tea( PET) from Yunnan province,Fourier transform infrared spectroscopy( FT-IR) and two-dimensional correlation infrared spectroscopy( 2D-IR) were used plus a three-level infrared spectroscopy method( FT-IR combined with second derivative infrared spectroscopy( SD-IR) and 2D-IR). The comparative analysis of FT-IR shows that 1 644,1 517,1 451,1 237 and 1 040 cm-1are common characteristic peaks of GT,BT and PET and the absorption intensity of them decreases in order. Accordingly,the three kinds of tea can be differentiated primarily. The differences of peak position and peak intensity among the three teas become more evident in SD-IR. By comparison with SD-IR of calcium oxalate,it can be found that the relative content of calcium oxalate in the three tea samples is as follows:GT BT PET. Subsequently,2D-IR spectra have displayed the differences among the three types tea in a visualized way. The strongest auto-peak in 2D-IR of GT,BT and PET is 1 635,1 563 and 1 639 cm-1respectively. The analysis results have demonstrated that GT,BT and PET have their own infrared spectral characteristics and can be identified unambiguously by the three-level infrared spectrum analysis." @default.
- W2377970070 created "2016-06-24" @default.
- W2377970070 creator A5056857273 @default.
- W2377970070 date "2014-01-01" @default.
- W2377970070 modified "2023-09-27" @default.
- W2377970070 title "Analysis and identification of three kinds of tea from Yunnan province by three-level infrared spectroscopy" @default.
- W2377970070 hasPublicationYear "2014" @default.
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