Theanine and Caffeine content of infusions prepared from commercial tea samples

Pharmacognosy Magazine

Volumn 12, Issue 45, 2016, Pages 75-78

  Boros, Klára ^a   Jedlinszki, Nikoletta ^a   Csupor, Dezso ^a  

^a UNIVERSITY OF SZEGED   (Hungary)

Author keywords

Caffeine; Camellia sinensis; high performance liquid chromatography diode array detector; quantitative analysis tea; theanine

Indexed keywords

CAFFEINE; THEANINE;

ARTICLE; CHEMICAL COMPOSITION; CONTROLLED STUDY; CORRELATION COEFFICIENT; DRUG DETERMINATION; DRUG FORMULATION; DRUG INFUSION; DRUG ISOLATION; FOOD PROCESSING; HIGH PERFORMANCE LIQUID CHROMATOGRAPHY; METABOLITE; NONHUMAN; QUANTITATIVE ANALYSIS; TEA;

EID: 84959020215     PISSN: 09731296     EISSN: 09764062     Source Type: Journal    
DOI: 10.4103/0973-1296.176061     Document Type: Article

References (29)

1. Khan N, Mukhtar H. Tea polyphenols for health promotion. Life Sci 2007;81:519-33.
2. Nehlig A, Daval JL, Debry G. Caffeine and the central nervous system: Mechanisms of action, biochemical, metabolic and psychostimulant effects. Brain Res Brain Res Rev 1992;17:139-70.
3. L-theanine. Monograph. Altern Med Rev 2005;10:136-8.
4. Kakuda T, Nozawa A, Unno T, Okamura N, Okai O. Inhibiting effects of theanine on caffeine stimulation evaluated by EEG in the rat. Biosci Biotechnol Biochem 2000;64:287-93.
5. Kobayashi K, Nagato Y, Aoi N, Juneja LR, Kim M, Yamamoto T, et al. Effects of L-theanine on the release of α-brain waves in human volunteers. Nippon Nogeikagaku Kaishi 2002;72:153-7.
6. Cooper R, Morré DJ, Morré DM. Medicinal benefits of green tea: Part I. Review of noncancer health benefits. J Altern Complement Med 2005;11:521-8.
7. Kelly SP, Gomez-Ramirez M, Montesi JL, Foxe JJ. L-theanine and caffeine in combination affect human cognition as evidenced by oscillatory alpha-band activity and attention task performance. J Nutr 2008;138:1572S-7S.
8. Owen GN, Parnell H, De Bruin EA, Rycroft JA. The combined effects of L-theanine and caffeine on cognitive performance and mood. Nutr Neurosci 2008;11:193-8.
9. Juneja LR, Chu DC, Okubo T, Nagato Y, Yokogoshi H. L-theanine-A unique amino acid of green tea and its relaxation effect in humans. Trends Food Sci Technol 1999;10:199-204.
10. Keenan EK, Finnie MD, Jones PS, Rogers PJ, Priestley CM. How much theanine in a cup of tea? Effects of tea type and method of preparation. Food Chem 2011;125:588-94.
11. Friedman M, Levin CE, Choi SH, Lee SU, Kozukue N. Changes in the composition of raw tea leaves from the Korean Yabukida plant during high-temperature processing to pan-fried Kamairi-cha green tea. J Food Sci 2009;74:C406-12.
12. Mohanpuria P, Kumar V, Yadav SK. Tea caffeine: Metabolism, functions, and reduction strategies. Food Sci Biotechnol 2010;19:275-87.
13. De Mariza CA, Moreira RF. Cafeína: Revisão sobre métodos de análise. Quim Nova 2007;30:99-105.
14. Feldheim W, Yongvanit P, Cummings PH. Investigation of the presence and significance of theanine in the tea plant. J Sci Food Agric 1986;37:527-34.
15. Csupor D, Boros K, Hunyadi A, Veres K, Hohmann J. Validation of a densitometric method for the determination of theanine in tea extracts using CP atlas software. J Planar Chromatogr Mod TLC 2012;25:571-4.
16. Peng L, Song X, Shi X, Li J, Ye C. An improved HPLC method for simultaneous determination of phenolic compounds, purine alkaloids and theanine in Camellia species. J Food Compost Anal 2008;21:559-63.
17. Ying Y, Ho JW, Chen ZY, Wang J. Analysis of theanine in tea leaves by HPLC with fluorescence detection. J Liq Chromatogr Relat Technol 2005;28:727-37.
18. Syu KY, Lin CL, Huang HC, Lin JK. Determination of theanine, GABA, and other amino acids in green, oolong, black, and Pu-erh teas with dabsylation and high-performance liquid chromatography. J Agric Food Chem 2008;56:7637-43.
19. Desai MJ, Armstrong DW. Analysis of derivatized and underivatized theanine enantiomers by high-performance liquid chromatography/atmospheric pressure ionization-mass spectrometry. Rapid Commun Mass Spectrom 2004;18:251-6.
20. Hsieh MM, Chen SM. Determination of amino acids in tea leaves and beverages using capillary electrophoresis with light-emitting diode-induced fluorescence detection. Talanta 2007;73:326-31.
21. Horie H, Mukai T, Kohata K. Simultaneous determination of qualitatively important components in green tea infusions using capillary electrophoresis. J Chromatogr A 1997;758:332-5.
22. Aucamp JP, Hara Y, Apostolides Z. Simultaneous analysis of tea catechins, caffeine, gallic acid, theanine and ascorbic acid by micellar electrokinetic capillary chromatography. J Chromatogr A 2000;876:235-42.
23. Song R, Kelman D, Johns KL, Wright AD. Correlation between leaf age, shade levels, and characteristic beneficial natural constituents of tea (Camellia sinensis) grown in Hawaii. Food Chem 2012;133:707-14.
24. Zhu X, Chen B, Ma M, Luo X, Zhang F, Yao S, et al. Simultaneous analysis of theanine, chlorogenic acid, purine alkaloids and catechins in tea samples with the help of multi-dimension information of on-line high performance liquid chromatography/electrospray-mass spectrometry. J Pharm Biomed Anal 2004;34:695-704.
25. Xu N, Chen ZM. Green tea, black tea and semi-fermented tea. In: Zhen YS, editor. Tea-Bioactivity and Therapeutic Potential. London and New York: Taylor and Francis; 2002. p. 35-56.
26. Tomlins KI, Mashingaidze A. Influence of withering, including leaf handling, on the manufacturing and quality of black teas-A review. Food Chem 1997;60:573-80.
27. Sari F, Velioglu YS. Changes in theanine and caffeine contents of black tea with different rolling methods and processing stages. Eur Food Res Technol 2013;237:229-36.
28. Ekborg-Ott KH, Taylor A, Armstrong DW. Varietal differences in the total and enantiomeric composition of theanine in tea. J Agric Food Chem 1997;45:353-63.
29. Horanni R, Engelhardt UH. Determination of amino acids in white, green, black, oolong, pu-erh teas and tea products. J Food Compost Anal 2013;31:94-100.