Calculated Mean Content Values

Units Average Min Max Standard Deviation
mg/100 ml 4.63 0.07 14.58 4.38
mol/100 ml 2.72e-05 4.11e-07 8.57e-05 2.57e-05

Values calculated by aggregating data from 39 different samples from 8 unique publications.

Aglycone Mean Content Values

Aglycone Units Average Min Max Standard Deviation
Gallic acid mg/100 ml 4.63 0.07 14.58 4.38
mol/100 ml 2.72e-05 4.11e-07 8.57e-05 2.57e-05

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
0.12 mg/100 ml Pu-erh commercial tea - Yun-Nan Co. no 1
0.07 mg/100 ml Pu-erh commercial tea - Tien-Jen-Ming-Cha no 1
0.20 mg/100 ml Pu-erh commercial tea - I-Pin-Tang Cha-Chuang no 1
0.18 mg/100 ml Pu-erh commercial tea - China Native & Animal I&E Corp. no 1
0.09 mg/100 ml Pu-erh commercial tea - San-Hua Cha-Hang no 1
0.10 mg/100 ml Pu-erh commercial tea - Tein-Hsiang-Ming-Cha no 1
0.25 mg/100 ml Pu-erh commercial tea - Shang-Mei Cha-Chuang no 1
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
5.37 mg/100 ml Black tea infusion, Assam, Grounded no 1
8.18 mg/100 ml Black tea infusion, Assam, Leaf no 1
4.57 mg/100 ml Black tea infusion, Sikkim, Leaf no 1
6.51 mg/100 ml Black tea infusion, Darjeeling, Grounded no 1
7.01 mg/100 ml Black tea infusion, Darjeeling, Leaf no 1
6.84 mg/100 ml Black tea infusion, Sri Lanka, Grounded no 1
7.68 mg/100 ml Black tea infusion, Sri Lanka, Leaf no 1
7.43 mg/100 ml Black tea infusion, Kenya, Grounded no 1
6.51 mg/100 ml Black tea infusion, Soviet Union, Leaf no 1
10.35 mg/100 ml Black tea infusion, Anhui, Leaf no 1
7.76 mg/100 ml Black tea infusion, Java, 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
11.55 mg/100 ml Black Tea infusion 1 (minced leaves) 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
9.50 mg/100 ml Black tea infusion, Assam no 1
Rechner, A.R.; Wagner, E.; Buren van, L.; Put van de, F.; Wiseman, S.; Rice-Evans, C.A. (2002) Black tea represents a major source of dietary phenolics among regular tea drinkers. Free radical research 36:1127-1135
Original Content Value Original Food Description Commercial Origin # of Samples Analyzed
2.04 mg/100 ml Black tea infusion brand 5 no 3
2.19 mg/100 ml Black tea infusion brand 6 no 3
1.92 mg/100 ml Black tea infusion brand 1 no 3
1.84 mg/100 ml Black tea infusion brand 7 no 3
1.73 mg/100 ml Black tea infusion brand 2 no 3
1.75 mg/100 ml Black tea infusion brand 3 no 3
2.20 mg/100 ml Black tea infusion brand 4 no 3
Luximon-Ramma A., Bahorun T., Crozier A., Zbarsky V., Datla K.P., Dexter D.T., Aruoma O.I. (2005) Characterization of the antioxidant functions of flavonoids and proanthocyanidins in Mauritian black teas. Food Research International 38:357-367
Original Content Value Original Food Description Commercial Origin # of Samples Analyzed
9.15 mg/100 ml Black tea - Brand "3-Pavillions" yes 1
10.05 mg/100 ml Black tea - Brand "Black Label" yes 1
9.29 mg/100 ml Black tea - Brand "Red Label" yes 1
9.46 mg/100 ml Black tea - Brand "Extra" yes 1
13.19 mg/100 ml Black tea - Brand "Ouvagalia" yes 1
7.33 mg/100 ml Black tea - Brand "Chartreuse" yes 1
14.58 mg/100 ml Black tea - Brand "Corson" yes 1
9.61 mg/100 ml Black tea - Brand "La Flora" yes 1
14.15 mg/100 ml Black tea - Brand "Buccaneer's Choice" yes 1
0.45 mg/100 ml Black tea - Fresh tea leaves 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
3.11 mg/100 ml Black 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
3.60 mg/100 ml Black tea - Infusion - 100°C no 1