Calculated Mean Content Values

Units Average Min Max Standard Deviation
mg/100 ml 19.68 1.00e-02 100.00 25.11
mol/100 ml 6.42e-05 3.27e-08 3.27e-04 8.20e-05

Values calculated by aggregating data from 77 different samples from 16 unique publications.

Aglycone Mean Content Values

Aglycone Units Average Min Max Standard Deviation
(-)-Epigallocatechin mg/100 ml 19.68 1.00e-02 100.00 25.11
mol/100 ml 6.42e-05 3.27e-08 3.27e-04 8.20e-05

Original Content Values Used to Produce Means

Ding, M., Yang, H., Xiao, S. (1999) Rapid, direct determination of polyphenols in tea by reversed-phase column liquid chromatography. Journal of chromatography A 849:637-640 PubMed (10457459)
Original Content Value Original Food Description Commercial Origin # of Samples Analyzed
34.56 mg/100 ml Chinese Green Tea Yunnan no 1
44.00 mg/100 ml Chinese Green Tea Guangdong no 1
21.89 mg/100 ml Chinese Green Tea Jinghua no 1
Lin, J.K.;Lin, C.L.;Liang, Y.C.;Lin-Shiau, S.Y.;Juan, I.M. (1998) Survey of catechins, gallic acid, and methylxanthines in green, oolong, pu-erh and black teas. Journal of Agricultural and Food Chemistry 46:3635-3642
Original Content Value Original Food Description Commercial Origin # of Samples Analyzed
0.05 mg/100 ml Chinese green commercial tea - Fu-Chien Mao-Feng no 1
0.05 mg/100 ml Chinese green commercial tea - He-Nan Hsin-Yang Mao-Chien no 1
0.04 mg/100 ml Chinese green commercial tea - Hu-Pei He-Feng Fu-Hsi no 1
3.00 mg/100 ml Chinese green commercial tea - Chue-Chiag longjing no 1
0.02 mg/100 ml Chinese green commercial tea - Hu-Pei San-Hsia Mao-Chien no 1
0.04 mg/100 ml Chinese green commercial tea - Shan-Hsi Tsu-Yang no 1
0.04 mg/100 ml Chinese green commercial tea - He-Nan Hsin-Yang Yun-Woo no 1
0.03 mg/100 ml Chinese green commercial tea - Che-Chiang Hang-Chou longjing no 1
0.01 mg/100 ml Chinese green commercial tea - An-Hui Huang-Shan Yun-Woo no 1
0.02 mg/100 ml Chinese green commercial tea - An-Hui Pi-Luo-Chun no 1
0.07 mg/100 ml Chinese green commercial tea - Bei-Jing Mo-Li-Hua no 1
0.05 mg/100 ml Chinese green commercial tea - Fu-Chien Hu-Chiu Mo-Li-Hua no 1
0.03 mg/100 ml Chinese green commercial tea - Ssu-Chuan Cheng-Tou Mo-Li-Hua no 1
0.06 mg/100 ml Chinese green commercial tea - Ssu-Chuan Yung-Chuan Mo-Li-Hua no 1
0.05 mg/100 ml Chinese green commercial tea - San-Shya, Taipei longjing no 1
0.05 mg/100 ml Japanese green commercial tea - Osaka-Fu no 1
0.07 mg/100 ml Japanese green commercial tea - Aichi-Ken no 1
0.09 mg/100 ml Japanese green commercial tea - Kyoto Mat-Cha no 1
0.06 mg/100 ml Japanese green commercial tea - Shizuoka 1 no 1
0.09 mg/100 ml Japanese green commercial tea - Shizuoka 2 no 1
0.10 mg/100 ml Japanese green commercial tea - Kyoto Sen-Cha no 1
0.07 mg/100 ml Japanese green commercial tea - Kyoto no 1
0.07 mg/100 ml Japanese green commercial tea - Fukuoka-Ken no 1
0.11 mg/100 ml Japanese green commercial tea - Tokyo decocted 1 no 1
0.11 mg/100 ml Japanese green commercial tea - Tokyo decocted 2 no 1
0.09 mg/100 ml Japanese green commercial tea - Tokyo decocted 3 no 1
0.09 mg/100 ml Japanese green commercial tea - Tokyo Yn-Loo no 1
0.06 mg/100 ml Japanese green commercial tea - Tokyo Thu-Ya no 1
Khokhar, S.; Magnusdottir, S.G.M. (2002) Total phenol, catechin, and caffeine contents of teas commonly consumed in the United Kingdom. Journal of Agricultural and Food Chemistry 50:565-570 PubMed (11804530)
Original Content Value Original Food Description Commercial Origin # of Samples Analyzed
34.60 mg/100 ml Green tea Bandia (Japan) no 1
16.20 mg/100 ml Chinese Green Tea no 1
31.40 mg/100 ml Japanese Green Tea 1 no 1
26.00 mg/100 ml Green tea Osaka-Fu no 1
32.00 mg/100 ml Japanese Green Tea 2 no 1
19.00 mg/100 ml Indian Green Tea no 1
21.70 mg/100 ml Green tea Chun mee (China) no 1
Bronner, W.E.; Beecher, G.R. (1998) Method for determining the content of catechins in tea infusions by high-performance liquid chromatography. Journal of Chromatography A 805:137-142 PubMed (20109129)
Original Content Value Original Food Description Commercial Origin # of Samples Analyzed
2.00 mg/100 ml Green tea infusion - 3 min no 2
4.00 mg/100 ml Green tea infusion - 20 min no 2
5.00 mg/100 ml Jasmine tea infusion - 3 min no 2
7.00 mg/100 ml Jasmine tea infusion - 20 min no 2
Lee, B.-L.; Ong, C.-N. (2000) Comparative analysis of tea catechins ans theaflavins by high-performance liquid chromatography and capillary electrophoresis. Journal of Chromatography A 881:439-447
Original Content Value Original Food Description Commercial Origin # of Samples Analyzed
36.53 mg/100 ml Japanese green tea no 1
28.07 mg/100 ml Long-jing no 1
23.46 mg/100 ml Jasmine no 1
Pascual-Teresa de, S.; Santos-Buelga, C.; Rivas-Gonzalo, J.C. (2000) Quantitative analysis of flavan-3-ols in Spanish foodstuffs and beverages. Journal of Agricultural and Food Chemistry 48:5331-5337 PubMed (11087482)
Original Content Value Original Food Description Commercial Origin # of Samples Analyzed
10.72 mg/100 ml Green tea infusion no 3
Kuhr, S.; Engelhardt, U.H. (1991) Determination of flavanols, theogallin. Zeitschrift fuer Lebensmittel Untersuchung und Forschung 192:526-529 PubMed (8717094)
Original Content Value Original Food Description Commercial Origin # of Samples Analyzed
53.77 mg/100 ml Green tea infusion, China, Leaf no 1
54.27 mg/100 ml Green tea infusion, Taiwan, Leaf no 1
Pelillo, M.; Biguzzi, B.; Bendini, A.; Gallina Toschi, T.; Vanzini, M.; Lercker, G. (2002) Preliminary investigation into development of HPLC with UV and MS-electrospray detection for the analysis of tea catechins. Food Chemistry 78:369-374
Original Content Value Original Food Description Commercial Origin # of Samples Analyzed
24.75 mg/100 ml Green Tea infusion 4 (whole leaves) no 1
28.50 mg/100 ml Green Tea infusion 5 (minced leaves) no 1
Long, H.; Zhu, Y.; Huang, T.; Coury, L.A.; Kissinger, P.T. (2001) Identification and determination of polyphenols in tea by liquid chromatography with multichannel electrochemical detection. Journal of Liquid Chromatography and Related Technologies 24:1105-1114
Original Content Value Original Food Description Commercial Origin # of Samples Analyzed
5.00 mg/100 ml Green tea infusion, Luan Guapian, China no 1
2.55 mg/100 ml Green tea infusion, Longjin, China no 1
1.80 mg/100 ml Green tea infusion, Maofeng, China no 1
8.25 mg/100 ml Green tea infusion, Suntory, Japan no 1
9.15 mg/100 ml Green tea infusion, Dynasty, Japan no 1
Zhang, A.; Chan, P.T.; Luk, Y.S.; Ho, W.K.K.; Chen, Z.-Y. (1997) Inhibitory effect of jasmine green tea epicatechin isomers on LDL-oxidation. Journal of Nutritional biochemistry 8:334-340
Original Content Value Original Food Description Commercial Origin # of Samples Analyzed
100.00 mg/100 ml Jasmine green tea infusion no 1
Lin Y., Juan I., Chen Y., Liang Y., Lin J. (1996) Composition of polyphenols in fresh tea leaves and associations of their oxygen-radical-absorbing capacity with antiproliferative actions in fibroblast cells. Journal of Agricultural and Food Chemistry 44:1387-1394
Original Content Value Original Food Description Commercial Origin # of Samples Analyzed
16.25 mg/100 ml Green tea infusion, Chin-Shin-Dah-Pan no 1
40.00 mg/100 ml Green tea infusion, TTE 12 no 1
48.75 mg/100 ml Green tea infusion, Assam no 1
26.25 mg/100 ml Green tea infusion, Wun-Yi no 1
72.50 mg/100 ml Green tea infusion, Gan-Tzy (Longjing tea) no 1
Price W.E., Spitzer J.C. (1993) Variations in the amounts of individual flavonols in a range of green teas. Food Chemistry 47:271-276
Original Content Value Original Food Description Commercial Origin # of Samples Analyzed
64.64 mg/100 ml Loong Ching green tea no 1
57.60 mg/100 ml Green tea - Grand Tea Co. no 1
62.88 mg/100 ml Special Chunmee no 1
55.20 mg/100 ml Jasmine tea - Fujian no 1
87.04 mg/100 ml Sen Cha Uji Tsuyu no 1
73.76 mg/100 ml Sen Cha Uji Tsuyu no 1
80.32 mg/100 ml Lung Ching China tea no 1
44.00 mg/100 ml Jasmine tea Bulk no 1
Begona Barroso, M.; Werken van de, G. (1999) Determination of green and black tea composition by capillary electrophoresis. Journal of High Resolution Chromatography 22:225-230 PubMed (19266552)
Original Content Value Original Food Description Commercial Origin # of Samples Analyzed
18.30 mg/100 ml Green tea infusion no 1
Stewart A.J., Mullen W., Crozier A. (2005) On-line high-performance liquid chromatography analysis of the antioxidant activity of phenolic compounds in green and black tea. Molecular Nutrition and Food Research 49:52-60 PubMed (15602765)
Original Content Value Original Food Description Commercial Origin # of Samples Analyzed
48.77 mg/100 ml Green tea infusion no 1
Kilmartin P.A., Chyong F.H. (2003) Characterisation of polyphenols in green, oolong, and black teas, and in coffee, using cyclic voltammetry. Food Chemistry 82:501-512
Original Content Value Original Food Description Commercial Origin # of Samples Analyzed
8.00 mg/100 ml Green tea - Infusion - 100°C no 1
Wang H., Helliwell K., You X. (2000) Isocratic elution system for the determination of catechins, caffeine and gallic acid in green tea using HPLC. Food Chemistry 68:115-121
Original Content Value Original Food Description Commercial Origin # of Samples Analyzed
29.70 mg/100 ml Green tea infusion - Gunpowder no 1
30.10 mg/100 ml Green tea infusion - Roasted green tea no 1
36.20 mg/100 ml Green tea infusion - Sencha no 1
0.90 mg/100 ml Green tea infusion - Keemun no 1
1.84 mg/100 ml Green tea infusion - Sri Lanka no 1