Table 1.
Total polyphenols, total catechins and five flavan-3-ols contents in monthly samples of fresh green tea.
| Tea samples | Monthly mean total polyphenolsα (g/kg) | Monthly mean total catechinsα (g/kg) | Content (mg/g) of five flavan-3-ols in the solutions of tea powders as quantified by HPLC | ||||
|---|---|---|---|---|---|---|---|
|
| |||||||
| Catechin (C) | Epicatechin (EC) | Epigallocatechin (EGC) | Epigallocatechin gallate (EGCG) | Epicatechin gallate (ECG) | |||
| April | 227.63d | 140.83f | 1.56 | 13.34 | 30.13 | 62.90 | 18.97 |
| May | 252.75c | 197.63d | 2.43 | 16.03 | 26.52 | 66.70 | 21.83 |
| June | 266.28c | 226.02c | 3.48 | 21.34 | 39.60 | 99.31 | 37.77 |
| July | 283.03b | 249.69b | 3.66 | 13.61 | 34.02 | 75.09 | 19.28 |
| August | 317.81a | 271.40a | 3.37 | 23.71 | 43.66 | 102.17 | 39.47 |
| September | 288.80b | 251.04b | 3.14 | 27.77 | 38.93 | 90.76 | 36.98 |
| October | 219.90d | 185.19e | 1.74 | 15.64 | 29.39 | 72.25 | 20.22 |
Results are shown as mean of three replications. Mean values within the same column followed by same superscript letters do not differ significantly when compared by Duncan’s Multiple Range Test. CD (5%) for monthly mean total polyphenols = 14.12. CD (5%) for monthly mean total catechins = 10.75.
α
Estimated in freshly prepared extracts of fresh green tea shoots.