Table 1 Contents of caffeine, catechins, and non-catechin flavonoids in green tea, black tea, and hawk tea
Ingredient | Green tea (n = 6) | Black tea (n = 6) | Hawk tea (n = 6) | |||
|---|---|---|---|---|---|---|
µg g−1 | CV (%) | µg g−1 | CV (%) | µg g−1 | CV (%) | |
Caffeine | 2542.93 ± 203.48 | 8.0 | 2297.13 ± 126.03 | 5.49 | 35.27 ± 2.04 | 5.78 |
Catechin | ||||||
(+)-Catechin (C) | 356.67 ± 25.98 | 7.28 | 13.95 ± 0.43 | 3.08 | 1707.85 ± 43.13 | 2.53 |
(−)-Epicatechin (EC) | 3298.06 ± 76.32 | 2.31 | 602.56 ± 33.20 | 5.51 | 1024.77 ± 24.31 | 2.37 |
(−)-Catechin gallate (CG) | 1840.22 ± 34.18 | 1.86 | 46.91 ± 4.27 | 9.10 | 14.90 ± 0.65 | 4.34 |
(−)-Epicatechin gallate (ECG) | 2601.12 ± 77.22 | 2.97 | 427.02 ± 31.22 | 7.31 | 18.04 ± 1.02 | 5.66 |
(−)-Gallocatechin (GC) | 2541.68 ± 33.61 | 1.32 | 61.54 ± 4.22 | 6.86 | 14.78 ± 0.98 | 6.65 |
(−)-Epigallocatechin (EGC) | 462.37 ± 17.75 | 3.84 | 397.05 ± 17.54 | 4.42 | 34.25 ± 0.98 | 2.86 |
(−)-Gallocatechin gallate (GCG) | 172.05 ± 20.11 | 11.69 | 662.28 ± 38.11 | 5.75 | 26.37 ± 1.80 | 6.83 |
(−)-Epigallocatechin gallate (EGCG) | 445.64 ± 35.30 | 7.92 | 378.11 ± 26.16 | 6.92 | 35.83 ± 2.40 | 6.71 |
Non-catechin flavonoids | ||||||
Kaempferol | 13.90 ± 2.33 | 16.78 | 31.87 ± 3.69 | 11.58 | 84.92 ± 3.23 | 3.81 |
Kaempferol 3-O-α-l-rhamnoside | 1.04 ± 0.42 | 40.69 | 2.33 ± 0.15 | 6.37 | 1365.78 ± 61.81 | 4.53 |
Kaempferol 3-O-β-d-glucoside | – | – | 13.04 ± 0.94 | 7.24 | 551.88 ± 25.74 | 4.66 |
Quercetin | 18.42 ± 2.39 | 12.98 | 14.07 ± 1.51 | 10.74 | 92.82 ± 1.25 | 1.35 |
Quercetin 3-O-β-d-glucoside | 50.92 ± 2.28 | 4.47 | 15.60 ± 1.23 | 7.91 | 516.52 ± 14.87 | 2.88 |
Quercetin 3-O-β-d-galactoside | 70.37 ± 3.83 | 5.44 | 25.65 ± 5.05 | 19.69 | 664.82 ± 43.05 | 6.48 |
Quercetin 3-O-α-l-rhamnoside | 0.02 ± 0.01 | 44.29 | 0.54 ± 0.18 | 32.78 | 47.05 ± 3.04 | 6.46 |
Rutin | 56.24 ± 2.46 | 4.34 | 15.13 ± 1.08 | 7.11 | 45.50 ± 2.78 | 6.10 |
Apigenin | 0.15 ± 0.02 | 14.05 | 0.37 ± 0.02 | 6.27 | 0.61 ± 0.03 | 4.37 |
Apigenin 3-O-β-d-glucoside | 0.29 ± 0.22 | 75.70 | 0.12 ± 0.01 | 10.89 | 0.42 ± 0.04 | 8.98 |
Isorhamnetin | 0.46 ± 0.03 | 7.05 | 1.54 ± 0.10 | 6.28 | 1.86 ± 0.05 | 2.46 |
Isorhamnetin 3-O-β-d-glucoside | 0.20 ± 0.21 | 104.81 | 0.14 ± 0.06 | 41.00 | 1.15 ± 0.08 | 6.75 |
Naringenin | 2.14 ± 1.33 | 62.28 | 9.72 ± 0.39 | 4.02 | 3.61 ± 0.27 | 7.54 |
Naringin | – | – | – | – | – | – |
Luteolin | 0.41 ± 0.13 | 30.72 | 0.98 ± 0.01 | 0.87 | 1.24 ± 0.06 | 4.83 |
Luteolin 7-O-β-d-glucoside | – | – | – | – | – | – |
Chrysoeriol | – | – | 0.20 ± 0.01 | 4.71 | 0.08 ± 0.01 | 16.51 |
Taxifolin | 0.92 ± 0.10 | 10.64 | 0.61 ± 0.14 | 22.79 | 1.39 ± 0.10 | 7.24 |
Eriodictyol | 0.44 ± 0.02 | 5.20 | 1.29 ± 0.03 | 2.24 | 0.14 ± 0.05 | 38.49 |
Myricetin | 8.45 ± 0.35 | 4.18 | 1.88 ± 0.29 | 15.62 | 0.58 ± 0.14 | 24.91 |
