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Evaluation of Oolong Teas Using 1H and 13C Solid-state NMR, Sensory Analysis, and Multivariate Statistics.
- Source :
-
Journal of the Chinese Chemical Society . Sep2016, Vol. 63 Issue 9, p792-799. 1p. - Publication Year :
- 2016
-
Abstract
- The classification of Wuyi rock tea (Oolong type) is performed by solid-state nuclear magnetic resonance ( NMR) for the first time. Quality differences of eight Oolong teas grown in Wuyi Mountains in southeastern China are analyzed by a combination of solid-state 1H and 1H- 13C CP-MAS (cross-polarization magic angle spinning) NMR, partial least-squares discriminate analysis ( PLS-DA), and quantitative descriptive analysis ( QDA). The contents of caffeine, carbohydrate, polyphenol, and terpenoid were distinguished, and quantification of the metabolites was made based on the 1H and 13C MAS spectra. PLS-DA shows a separation of high- and low-quality Oolong teas, in good agreement with the result of QDA. These results indicate that NMR metabolomic approach enables us to differentiate the analyzed teas based on their chemical composition. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00094536
- Volume :
- 63
- Issue :
- 9
- Database :
- Academic Search Index
- Journal :
- Journal of the Chinese Chemical Society
- Publication Type :
- Academic Journal
- Accession number :
- 118440387
- Full Text :
- https://doi.org/10.1002/jccs.201600183