Calculated Mean Content Values

Units Average Min Max Standard Deviation
mg/100 ml 0.47 0.00 9.15 1.53
mol/100 ml 1.02e-06 0.00 2.00e-05 3.35e-06

Values calculated by aggregating data from 40 different samples from 4 unique publications.

Aglycone Mean Content Values

Aglycone Units Average Min Max Standard Deviation
(+)-Gallocatechin mg/100 ml 0.31 0.00 6.11 1.03
mol/100 ml 6.83e-07 0.00 1.33e-05 2.24e-06
Gallic acid mg/100 ml 0.17 0.00 3.40 0.57
mol/100 ml 3.79e-07 0.00 7.41e-06 1.24e-06

Original Content Values Used to Produce Means

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
0.02 mg/100 ml Chinese green commercial tea - Fu-Chien Mao-Feng no 1
0.03 mg/100 ml Chinese green commercial tea - He-Nan Hsin-Yang Mao-Chien no 1
0.02 mg/100 ml Chinese green commercial tea - Hu-Pei He-Feng Fu-Hsi no 1
0.03 mg/100 ml Chinese green commercial tea - Chue-Chiag longjing no 1
0.01 mg/100 ml Chinese green commercial tea - Hu-Pei San-Hsia Mao-Chien no 1
0.02 mg/100 ml Chinese green commercial tea - Shan-Hsi Tsu-Yang no 1
0.02 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
0.01 mg/100 ml Chinese green commercial tea - An-Hui Pi-Luo-Chun no 1
0.04 mg/100 ml Chinese green commercial tea - Bei-Jing Mo-Li-Hua no 1
0.02 mg/100 ml Chinese green commercial tea - Fu-Chien Hu-Chiu Mo-Li-Hua no 1
0.01 mg/100 ml Chinese green commercial tea - Ssu-Chuan Cheng-Tou Mo-Li-Hua no 1
0.02 mg/100 ml Chinese green commercial tea - Ssu-Chuan Yung-Chuan Mo-Li-Hua no 1
0.02 mg/100 ml Chinese green commercial tea - San-Shya, Taipei longjing no 1
0.13 mg/100 ml Japanese green commercial tea - Osaka-Fu no 1
0.02 mg/100 ml Japanese green commercial tea - Aichi-Ken no 1
0.03 mg/100 ml Japanese green commercial tea - Kyoto Mat-Cha no 1
0.02 mg/100 ml Japanese green commercial tea - Shizuoka 1 no 1
0.02 mg/100 ml Japanese green commercial tea - Shizuoka 2 no 1
0.01 mg/100 ml Japanese green commercial tea - Kyoto Sen-Cha no 1
0.05 mg/100 ml Japanese green commercial tea - Kyoto no 1
0.02 mg/100 ml Japanese green commercial tea - Fukuoka-Ken no 1
0.02 mg/100 ml Japanese green commercial tea - Tokyo decocted 1 no 1
0.05 mg/100 ml Japanese green commercial tea - Tokyo decocted 2 no 1
0.03 mg/100 ml Japanese green commercial tea - Tokyo decocted 3 no 1
0.02 mg/100 ml Japanese green commercial tea - Tokyo Yn-Loo no 1
0.01 mg/100 ml Japanese green commercial tea - Tokyo Thu-Ya 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
3.60 mg/100 ml Green Tea infusion 4 (whole leaves) no 1
9.15 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
0.40 mg/100 ml Green tea infusion, Luan Guapian, China no 1
0.90 mg/100 ml Green tea infusion, Longjin, China no 1
0.55 mg/100 ml Green tea infusion, Maofeng, China no 1
0.60 mg/100 ml Green tea infusion, Suntory, Japan no 1
0.35 mg/100 ml Green tea infusion, Dynasty, Japan 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
0.51 mg/100 ml Green tea infusion - Gunpowder no 1
0.91 mg/100 ml Green tea infusion - Roasted green tea no 1
1.02 mg/100 ml Green tea infusion - Sencha no 1
0.00 mg/100 ml Green tea infusion - Keemun no 1
0.00 mg/100 ml Green tea infusion - Sri Lanka no 1