L-theanine, a natural constituent in tea, and its effect on mental state

Asia Pacific Journal of Clinical Nutrition

Volumn 17, Issue SUPPL. 1, 2008, Pages 167-168

  Nobre, Anna C ^b   Rao, Anling ^b   Owen, Gail N ^a  

^a UNILEVER RESEARCH VLAARDINGEN   (Netherlands)

^b UNIVERSITY OF OXFORD   (United Kingdom)

Author keywords

Alpha; Attention; EEG; L theanine; Tea

Indexed keywords

CAMELLIA SINENSIS;

GLUTAMIC ACID DERIVATIVE; PLACEBO; PLANT EXTRACT; THEANINE;

AROUSAL; ARTICLE; ATTENTION; BEVERAGE; BRAIN; CHEMISTRY; CLINICAL TRIAL; CONTROLLED CLINICAL TRIAL; CONTROLLED STUDY; DRUG EFFECT; ELECTROENCEPHALOGRAPHY; FEMALE; HUMAN; MALE; PHYSIOLOGY; RANDOMIZED CONTROLLED TRIAL; TEA; TIME;

AROUSAL; ATTENTION; BEVERAGES; BRAIN; ELECTROENCEPHALOGRAPHY; FEMALE; GLUTAMATES; HUMANS; MALE; PLACEBOS; PLANT EXTRACTS; TEA; TIME FACTORS;

EID: 46049116923     PISSN: 09647058     EISSN: None     Source Type: Journal    
DOI: None     Document Type: Article

References (11)

1. American Electroencephalographic Society guidelines for standard electrode position nomenclature. J Clin Neurophysiol. 1991;8:200-202.
2. Bastiaansen MC, Bocker KB, Brunia CH, de Munck JC, Spekreijse H. Event-related desynchronization during anticipatory attention for an upcoming stimulus: a comparative EEG/MEG study. Clin Neurophysiol. 2001;112:393-403.
3. Cartwright, RA, Roberts EAH, Wood DJ. Theanine an amino acid of N-ethyl amide present in tea. J. Sci. Food Agric. 1954;5:597-599.
4. Casimir J, Jadot J, Renard M. Separation and characterization of N-ethyl-gamma-glutamine from Xerocomus badius. Biochim Biophys Acta. 1960;39:462-468.
5. Foxe JJ, Simpson GV, Ahlfors SP. Parieto-occipital approximately 10 Hz activity reflects anticipatory state of visual attention mechanisms. Neuroreport. 1998;9:3929-3933.
6. Gomez-Ramirez A, Higgins BA, Owen GN, Rycroft JA, Mahoney J, Foxe JJ. The deployment of Intersensory Selective Attention: A high-density electrical mapping study of the effects of theanine. Clincial Neuropharmacology. 2007;30:25-38.
7. Ito K, Nagoto Y, Aoi N, Juneja LR, Kim M, Yamamoto T, Sugimoto S. Effects of L-theanine on the release of alphabrain waves in human volunteers, Nippon Nogei Kagaku Kaishi 1998;72:153-157. (Japanese)
8. Juneja LR, Chu D, Okubo T, Nagato Y, and Yokogoshi H. L-theanine - a unique amino acid of green tea and its relaxation effects in humans. Trends in Food Sci. Technol. 1999;10:199-204.
9. Nagashima Z, Nakagawa M, Tokumura H, Toriumi Y. Free amino acids in tea IV. Quantitative changes in the manufacture of black and green tea. J Agric Chem Soc Jpn.1957;31:169-173.
10. Song CH, Jung JH, Oh JS, Kim KS. Effects of thiamine on the release of brain alpha waves in adult males. Korean J Nutrition. 2003;36:918-923.
11. Unno T, Suzuki Y, Kakuda T, Hayakawa T, Tsuge H. Metabolism of theanine, gamma-glutamylethylamide, in rats. J Agric Food Chem. 1999;47:1593-1596.