Calculated Mean Content Values

Units Average Min Max Standard Deviation
mg/100 ml 1.58 0.06 13.00 2.97
mol/100 ml 2.20e-06 8.37e-08 1.81e-05 4.14e-06

Values calculated by aggregating data from 33 different samples from 3 unique publications.

Aglycone Mean Content Values

Aglycone Units Average Min Max Standard Deviation
Theaflavin mg/100 ml 1.24 0.05 10.24 2.34
mol/100 ml 1.74e-06 6.60e-08 1.43e-05 3.26e-06
Gallic acid mg/100 ml 0.38 0.01 3.09 0.70
mol/100 ml 5.23e-07 1.99e-08 4.31e-06 9.84e-07

Original Content Values Used to Produce Means

Liang, Y.; Lu, J.; Zhang, L.; Wu, S.; Wu, Y. (2003) Estimation of black tea quality by analysis of chemical composition and colour difference of tea infusion. Food Chemistry 80:283-290
Original Content Value Original Food Description Commercial Origin # of Samples Analyzed
0.08 mg/100 ml China black tea 2 no 1
0.10 mg/100 ml China black tea 3 no 1
0.12 mg/100 ml China black tea 4 no 1
0.06 mg/100 ml China black tea 5 no 1
4.02 mg/100 ml China black tea 6 no 1
2.14 mg/100 ml China black tea 7 no 1
1.68 mg/100 ml China black tea 8 no 1
0.26 mg/100 ml China black tea 1 no 1
0.80 mg/100 ml China black tea 9 no 1
13.00 mg/100 ml China black tea 10 no 1
1.36 mg/100 ml China black tea 11 no 1
3.36 mg/100 ml China black tea 12 no 1
0.86 mg/100 ml China black tea 13 no 1
1.64 mg/100 ml China black tea 14 no 1
0.06 mg/100 ml China black tea 15 no 1
0.06 mg/100 ml China black tea 16 no 1
0.50 mg/100 ml China black tea 17 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
12.04 mg/100 ml Black tea infusion no 1
Ding Z., Kuhr S., Engelhardt U.H. (1992) Influence of catechins and theaflavins on the astringent taste of black tea brews. Zeitschrift fuer Lebensmittel Untersuchung und Forschung 195:108-111
Original Content Value Original Food Description Commercial Origin # of Samples Analyzed
0.60 mg/100 ml Black tea infusion 14 - China - China black tea no 1
0.70 mg/100 ml Black tea infusion 15 - China - China black tea no 1
0.50 mg/100 ml Black tea infusion 1 - China - Feinster Tippy-Yunnan no 1
0.10 mg/100 ml Black tea infusion 2 - China - Darjeeling first flush no 1
0.20 mg/100 ml Black tea infusion 3 - China - Darjeeling second flush no 1
0.10 mg/100 ml Black tea infusion 4 - China - Darjeeling autumnal no 1
1.60 mg/100 ml Black tea infusion 5 - China - Assam broken no 1
1.40 mg/100 ml Black tea infusion 6 - China - Assam leaf no 1
0.40 mg/100 ml Black tea infusion 7 - China - Ceylon Lowgrown no 1
0.50 mg/100 ml Black tea infusion 8 - China - Ceylon Uva Highland no 1
0.80 mg/100 ml Black tea infusion 9 - China - Kenya no 1
0.80 mg/100 ml Black tea infusion 10 - China - China black tea no 1
1.00 mg/100 ml Black tea infusion 11 - China - China black tea no 1
0.90 mg/100 ml Black tea infusion 12 - China - China black tea no 1
0.40 mg/100 ml Black tea infusion 13 - China - China black tea no 1