Chemical constituents analysis of white tea of different qualities and different storage times
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Gallic acid, caffeine, catechins and amino acids in different grades of white teas and white teas under different storage times were determined in this study. The qualitative analysis was carried out on the main chemical components in white teas by ultra-performance liquid chromatography coupled with triple quadrupole tandem mass spectrometry (UPLC-QQQ-MS/MS). A total of 29 compounds were detected in white teas. The results showed that contents of total catechins and caffeine decreased with grades reducing. The middle-grade of white tea, Gong Mei, contained the amino acids at the highest content of 53.606 mg g−1, while the low grade Shou Mei contained the lowest (14.848 mg g−1). It was observed that contents of catechins and amino acids showed a similar tendency to decrease with storage times, while gallic acid increased with storing time (from 0.770 to 1.420 mM). This study suggested that high- and low-grade white tea should not be distinguished solely based on a single characteristic component or by market price, as well as providing an important basis for changes in characteristic components in white tea of different storage times.
KeywordsWhite tea Grade Storage Chemical components
The authors are grateful to the Fujian PinPinxiang Tea Co., Ltd for providing the tea samples. This study was supported by Anhui Provincial Natural Science Foundation of China (Grant No. 1408085MC61) and Key program of natural science fund for colleges and universities in Anhui Province (KJ2013A109).
Compliance with ethics requirements
Conflict of interest
Human and animal rights
This article does not contain any studies with human or animal subjects.
- 6.Zhong M, Yan Z, Lin Y (2012) Determination of caffeine, theanine, (-)-epicatechin and (-)-epigallocatechin gallate in tea by capillary zone electrophoresis. Food Sci 33:286–288Google Scholar
- 10.Zhou QQ, Sun WJ, Ye Y, Chen X (2014) Study on the main biochemical components of white tea stored at different years. Sci Technol Food Ind 35:351–354Google Scholar
- 15.Zhang J, Yang H, Wei C-L, Tai Y-L, Chen Q, Wan X-C (2013) Changes on characteristic components during shoots development in Camellia sinensis. J Tea 4:P234–P239Google Scholar
- 16.Saijo R (1983) Pathway of gallic acid biosynthesis and its esterification with catechins in young tea shoots. Agric Biol Chem 47:455–460Google Scholar
- 19.She GM, Zhang XL, Chen KK, Zhang YJ, Yang CR (2005) Content variation of theanine and gallic acid in Pu-Er tea. Acta Botanica Yunnanica 5:572–576Google Scholar
- 23.Gao L, Liu TX (2013) Study on chemicals and antioxidant activity of Pu-er teas stored at different time. Food Ind 34:127–130Google Scholar
- 26.Nobre AC, Rao A, Owen GN (2008) L-theanine, a natural constituent in tea, and its effect on mental state. Asia Pac J Clin Nutr 17:167–168Google Scholar
- 28.Wickremasinghe RL, Perera KPWC (1972) Site of biosynthesis and translocation of theanine in the tea plant. Tea Q 43:175–179Google Scholar
- 33.Jiang XL, Liu YJ, Li WW, Zhao L, Meng F, Wang YS, Tan HR, Yang H, Wei CL, Wan XC, Gao LP, Xia T (2013) Tissue-specific, development-dependent phenolic compounds accumulation profile and gene expression pattern in tea plant [Camellia sinensis]. PLoS One 8:1–14Google Scholar