Table 1.
Major tea constituents in different parts of tea plant
| Compound | Apical bud | 1st Leaf | 2nd Leaf | 3rd Leaf | 4th Leaf | 5th Leaf | Stem |
|---|---|---|---|---|---|---|---|
| Theanine | 1.32 ± 0.001 | 1.13 ± 0.020 | 1.42 ± 0.009 | 0.92 ± 0.007 | 0.82 ± 0.001 | 0.82 ± 0.000 | 1.98 ± 0.000 |
| GC | 0.13 ± 0.008 | 1.18 ± 0.001 | 1.49 ± 0.010 | 1.33 ± 0.020 | 0.62 ± 0.050 | 0.72 ± 0.020 | 0.53 ± 0.020 |
| EGC | 2.10 ± 0.060 | 15.90 ± 0.311 | 16.02 ± 0.030 | 15.90 ± 0.070 | 10.80 ± 0.110 | 10.44 ± 0.040 | 5.95 ± 0.070 |
| Catechin | ND | ND | ND | ND | ND | ND | ND |
| Caffeine | 29.91 ± 0.200 | 23.80 ± 0.040 | 22.09 ± 0.90 | 21.80 ± 0.140 | 14.70 ± 0.120 | 14.50 ± 0.020 | 1.54 ± 0.030 |
| EC | 1.53 ± 0.070 | 7.05 ± 0.080 | 6.71 ± 0.050 | 6.45 ± 0.070 | 4.33 ± 0.006 | 4.52 ± 0.0800 | 3.95 ± 0.010 |
| EGCG | 25.10 ± 0.110 | 28.90 ± 0.071 | 26.15 ± 0.150 | 24.90 ± 0.140 | 22.50 ± 0.080 | 20.63 ± 0.021 | 4.75 ± 0.110 |
| GCG | ND | ND | ND | ND | ND | ND | ND |
| ECG | 12.89 ± 0.040 | 11.60 ± 0.071 | 10.98 ± 0.090 | 9.35 ± 0.120 | 7.11 ± 0.010 | 6.41 ± 0.120 | 1.14 ± 0.001 |
| CG | ND | ND | ND | ND | ND | ND | ND |
| Phenolicsa | 74.93 ± 1.16 | 102.24 ± 0.55 | 91.02 ± 1.09 | 84.44 ± 0.75 | 64.20 ± 0.85 | 61.76 ± 0.62 | 36.63 ± 1.25 |
Results are expressed as mg/g and mean of three replicates ±SD
GC gallocatechin, EGC epigallocatechin, EC epicatechin, EGCG epigallocatechin gallate, GCG gallocatechin gallate, ECG epicatechin gallate, CG catechin gallate, ND not detected
aGallic acid equivalent