Table 2.
Total phenolic content (TPC), total flavonoid content (TFC), and antioxidant activity data (ORAC, ABTS, FRAP) of the studied tea brews. Samples are grouped by type of brew and type of tea and the means are reported in bold. Letters within each column indicate homogeneous subclasses resulting from Tukey’s post hoc multiple comparison test (p < 0.05) performed between all samples.
| Type | Code | TPC (mM GAEq) | TFC (mM CAEq) | ORAC (mM TXEq) | ABTS (mM TXEq) | FRAP (mM AAEq) |
|---|---|---|---|---|---|---|
| Cold | 5.4 ± 2.46 | 0.87 ± 0.413 | 21.8 ± 8.0 | 15.1 ± 5.8 | 10.4 ± 5.23 | |
| black | BA | 3.6 ± 0.15 E | 0.56 ± 0.028 H | 14.6 ± 2.0 I | 10.8 ± 1.5 D | 6.6 ± 0.87 H |
| BV | 2.1 ± 0.20 F | 0.32 ± 0.025 I | 11.0 ± 0.8 J | 7.2 ± 0.9 F | 4.3 ± 0.72 I | |
| BK | 2.4 ± 0.14 F | 0.36 ± 0.020 I | 13.3 ± 0.6 I | 7.7 ± 1.3 EF | 3.5 ± 0.59 I | |
| All | 2.7 ± 0.80 | 0.41 ± 0.131 | 13.0 ± 1.8 | 8.6 ± 2.0 | 4.8 ± 1.59 | |
| green | GK | 8.9 ± 0.35 A | 1.42 ± 0.115 A | 33.2 ± 2.5 A | 21.8 ± 3.1 A | 17.5 ± 1.78 A |
| yellow | YK | 6.9 ± 0.33 BC | 1.06 ± 0.088 D | 25.8 ± 1.8 DE | 18.7 ± 1.7 B | 13.4 ± 1.56 C |
| oolong | OK | 5.4 ± 0.23 D | 0.87 ± 0.066 EF | 22.5 ± 0.9 FG | 15.6 ± 1.8 C | 9.6 ± 1.43 F |
| OA | 6.8 ± 0.56 BC | 1.25 ± 0.114 B | 27.9 ± 2.2 C | 18.7 ± 2.5 B | 12.9 ± 1.83 CD | |
| All | 6.1 ± 1.44 | 1.06 ± 0.240 | 25.2 ± 4.5 | 17.1 ± 2.5 | 11.2 ± 3.26 | |
| white | WV | 7.1 ± 0.36 B | 1.10 ± 0.046 CD | 26.5 ± 1.8 CD | 20.6 ± 2.2 A | 15.4 ± 2.01 B |
| Hot | 5.8 ± 2.06 | 0.87 ± 0.309 | 20.9 ± 6.5 | 15.2 ± 5.0 | 9.2 ± 3.84 | |
| black | BA | 5.5 ± 0.36 D | 0.79 ± 0.052 G | 16.9 ± 1.1 H | 14.0 ± 1.1 C | 7.6 ± 0.53 GH |
| BV | 2.5 ± 0.21 F | 0.38 ± 0.028 I | 10.5 ± 0.5 J | 7.6 ± 0.4 F | 4.2 ± 0.23 I | |
| BK | 3.7 ± 0.16 E | 0.52 ± 0.036 H | 14.7 ± 1.1 I | 9.2 ± 0.7 DE | 4.4 ± 0.35 I | |
| All | 3.9 ± 1.54 | 0.56 ± 0.211 | 14.1 ± 3.2 | 10.3 ± 3.3 | 5.4 ± 1.92 | |
| green | GK | 9.0 ± 0.66 A | 1.30 ± 0.093 B | 30.4 ± 1.7 B | 22.2 ± 2.7 A | 15.2 ± 1.14 B |
| yellow | YK | 6.7 ± 0.39 C | 1.03 ± 0.075 D | 24.3 ± 1.4 EF | 18.6 ± 0.8 B | 11.8 ± 0.86 DE |
| oolong | OK | 5.3 ± 0.29 D | 0.84 ± 0.071 FG | 21.8 ± 0.8 G | 14.0 ± 1.0 C | 8.2 ± 0.53 G |
| OA | 7.2 ± 0.49 B | 1.16 ± 0.074 C | 26.6 ± 1.5 CD | 18.6 ± 1.0 B | 11.0 ± 0.79 E | |
| All | 6.3 ± 1.44 | 1.00 ± 0.180 | 24.2 ± 3.5 | 16.3 ± 3.0 | 9.6 ± 2.65 | |
| white | WV | 6.7 ± 0.53 C | 0.92 ± 0.058 E | 21.7 ± 0.9 G | 17.6 ± 1.2 B | 11.5 ± 0.98 E |