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 |