Table 3.
Comparative analysis of catechin levels in six different types of teas (n = 121), including gallocatechin (GC), epicatechin gallate (EGC), epicatechin (EC), epigallocatechin gallate (EGCG), gallocatechin gallate (GCG), epicatechin gallate (ECG), and catechin (C).
| Catechin | GT (n = 29) | YT (n = 7) | DT (n = 14) | WT (n = 12) | OT (n = 42) | BT (n = 17) | F Value | p Value |
|---|---|---|---|---|---|---|---|---|
| Gallocatechin | 1.55 ± 1.10 (0–4.26) |
0.61 ± 0.68 (0–2.00) |
0.59 ± 0.29 (0–1.22) a |
0.42 ± 0.33 (0–0.98) a |
2.31 ± 1.17 (0–4.95) a, b, c, d |
0.14 ± 0.21 (0–0.64) a, e |
20.70 | 0.000 |
| Percentage of total catechins |
1.10% | 0.48% | 6.62% | 0.39% | 2.76% | 0.47% | ||
| Epicatechin gallate |
22.01 ± 18.94 (0.84–79.73) |
14.08 ± 10.57 (4.16–30.84) |
1.36 ± 1.20 (0–4.26) a |
26.36 ± 32.27 (0.37–95.89) c |
20.07 ± 14.00 (0–50.19) c |
2.50 ± 2.73 (0–8.7) a, d, e |
6.458 | 0.000 |
| Percentage of total catechins |
15.53% | 10.98% | 15.20% | 24.66% | 23.95% | 8.18% | ||
| Epicatechin | 4.50 ± 2.97 (0.67–14.36) |
7.02 ± 3.99 (1.14–13.04) |
1.14 ± 0.79 (0–2.37) |
26.54 ± 36.68 (0.28–84.48) a, b, c |
2.62 ± 1.49 (0–6.95) d |
0.68 ± 0.89 (0.06–3.40) d |
9.478 | 0.000 |
| Percentage of total catechins |
3.18% | 5.47% | 12.73% | 24.82% | 3.13% | 2.22% | ||
| Epigallocatechin gallate | 83.90 ± 31.65 (46.11–158.61) |
82.38 ± 14.08 (65.42–107.9) |
3.57 ± 5.04 (0.11–18.87) a, b |
29.33 ± 30.13 (0.13–78.83) a, b |
46.43 ± 19.33 (1.87–86.42) a, b, c |
23.85 ± 45.66 (0.05–153.58) a, b |
23.42 | 0.000 |
| Percentage of total catechins |
59.21% | 64.21% | 39.88% | 27.43% | 55.41% | 78.10% | ||
| Gallocatechin gallate | 1.16 ± 0.77 (0.14–2.96) |
1.15 ± 0.75 (0.32–2.56) |
0.32 ± 0.27 (0.03–1.04) a |
0.25 ± 0.21 (0–0.55) a |
0.89 ± 0.94 (0–3.50) |
0.10 ± 0.13 (0.01–0.58) a, b, e |
7.591 | 0.000 |
| Percentage of total catechins |
0.82% | 0.90% | 3.62% | 0.23% | 1.06% | 0.33% | ||
| Epicatechin gallate |
24.94 ± 8.42 (11.89–41.84) |
20.66 ± 4.02 (15.25–27.86) |
1.40 ± 1.12 (0.04–3.55) a, b |
18.29 ± 11.45 (3.07–38.27) c |
10.09 ± 7.44 (0.44–46.60) a, b, c, d |
2.30 ± 1.54 (0.34–4.84) a, b, d, e |
34.83 | 0.000 |
| Percentage of total catechins |
17.60% | 16.10% | 15.64% | 17.11% | 12.04% | 7.53% | ||
| Catechin | 3.65 ± 5.83 (0–22.11) |
2.39 ± 1.16 (0.78–3.95) |
0.57 ± 0.53 (0–1.41) |
5.72 ± 15.15 (0.07–53.33) |
1.37 ± 2.46 (0–15.31) |
0.97 ± 1.19 (0–3.22) |
1.809 | 0.117 |
| Percentage of total catechins |
2.57% | 1.86% | 6.32% | 5.35% | 1.64% | 3.16% |
Tea type: OT, oolong tea; GT, green tea; WT, white tea; DT, dark tea; YT, yellow tea. Note: Data expressed as mean ± standard deviation and range (min-max). a, b, c, d, e Values with different letters indicate significant differences (p < 0.05) compared to GT, YT, DT, WT, and OT samples using ANOVA and Tukey post hoc test. The results were reported in mg/g to indicate the concentration of compounds in 1 g of tea leaves after conversion.