Calculated Mean Content Values
| Units |
Average |
Min |
Max |
Standard Deviation |
| mg/100 ml |
0.67 |
0.00 |
3.56 |
0.83 |
| mol/100 ml |
1.47e-06 |
0.00 |
7.77e-06 |
1.81e-06 |
Values calculated by aggregating data from 26
different samples
from
4 unique
publications.
Aglycone Mean Content Values
| Aglycone |
Units |
Average |
Min |
Max |
Standard Deviation |
| (+)-Gallocatechin |
mg/100 ml |
0.45 |
0.00 |
2.38 |
0.55 |
| mol/100 ml |
9.83e-07 |
0.00 |
5.19e-06 |
1.21e-06 |
| Gallic acid |
mg/100 ml |
0.25 |
0.00 |
1.32 |
0.31 |
| mol/100 ml |
5.46e-07 |
0.00 |
2.88e-06 |
6.70e-07 |
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 |
|
0.00 mg/100 ml
|
Pu-erh commercial tea - Yun-Nan Co. |
no |
1 |
|
0.00 mg/100 ml
|
Pu-erh commercial tea - Tien-Jen-Ming-Cha |
no |
1 |
|
0.00 mg/100 ml
|
Pu-erh commercial tea - I-Pin-Tang Cha-Chuang |
no |
1 |
|
0.00 mg/100 ml
|
Pu-erh commercial tea - China Native & Animal I&E Corp. |
no |
1 |
|
0.00 mg/100 ml
|
Pu-erh commercial tea - San-Hua Cha-Hang |
no |
1 |
|
4.00e-03 mg/100 ml
|
Pu-erh commercial tea - Tein-Hsiang-Ming-Cha |
no |
1 |
|
5.00e-03 mg/100 ml
|
Pu-erh commercial tea - Shang-Mei Cha-Chuang |
no |
1 |
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 |
|
0.14 mg/100 ml
|
China black tea 2 |
no |
1 |
|
0.36 mg/100 ml
|
China black tea 3 |
no |
1 |
|
0.38 mg/100 ml
|
China black tea 4 |
no |
1 |
|
0.40 mg/100 ml
|
China black tea 5 |
no |
1 |
|
0.28 mg/100 ml
|
China black tea 6 |
no |
1 |
|
3.56 mg/100 ml
|
China black tea 7 |
no |
1 |
|
0.44 mg/100 ml
|
China black tea 8 |
no |
1 |
|
0.98 mg/100 ml
|
China black tea 1 |
no |
1 |
|
1.12 mg/100 ml
|
China black tea 9 |
no |
1 |
|
0.40 mg/100 ml
|
China black tea 10 |
no |
1 |
|
0.54 mg/100 ml
|
China black tea 11 |
no |
1 |
|
0.96 mg/100 ml
|
China black tea 12 |
no |
1 |
|
1.34 mg/100 ml
|
China black tea 13 |
no |
1 |
|
0.78 mg/100 ml
|
China black tea 14 |
no |
1 |
|
0.42 mg/100 ml
|
China black tea 15 |
no |
1 |
|
1.06 mg/100 ml
|
China black tea 16 |
no |
1 |
|
0.66 mg/100 ml
|
China black tea 17 |
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 |
|
2.55 mg/100 ml
|
Black Tea infusion 1 (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 |
|
1.15 mg/100 ml
|
Black tea infusion, Hoji-cha, Japan |
no |
1 |