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Journal of Tea Science ›› 2008, Vol. 28 ›› Issue (2): 89-92.doi: 10.13305/j.cnki.jts.2008.02.004

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Determination of Theanine in Tea by Paired Ion Chromatography

GONG Yu-shun1,2, HUANG Jian-an1, CUI Xiang-xing3,*, LI Qing1, LI Yin-hua1, CHEN Jin-hua1   

  1. 1. Key Laboratory of Tea Science of Ministry of Education, Changsha 410128, China;
    2. Department of Medicinal Botanical Resource, Changsha 410128, China;
    3. Department of Medicinal Botanical Resource, Hunan Agricultural University, Changsha 410128, China
  • Received:2007-09-24 Revised:2008-01-15 Online:2008-04-15 Published:2019-09-16

Abstract: A paired ion chromatographic method was developed for rapid determination of theanine in tea. SDS was added as a paired ion reagent, mobile phase was a mixture of acetonitrile and phosphoric acid aqueous solution, detection wavelength was set at 200 nm. The retention time of Theanine was 6.27 min. The calibration of theanine was in good linearity in the range of 0.04~20 μg with the regression equation Y=1.51466×106X+3.28706×105(r2=0.99901). The detection limits was 1.15 ng(S/N=3). This method is rapid, simple, and accurate for the analysis of theanine in tea.

Key words: theanine, paired Ion Chromatography, tea

CLC Number: