Table 6.
Concentration of Catechins, Proanthocyanidins, and Gallic Acid Derivatives in White Tea
| concn. (mg/100 g) | |||||||
|---|---|---|---|---|---|---|---|
| peak no. | compd | [M − H]−(m/z) | λmax (nm) | group | MRRFP | group ref. standard | authentic standard |
| 1 | 1-galloylglucose* | 331 | 274 | 4 | 1.0 | 30.9 ± 1.2 | |
| 2 | 6-galloylglucose* | 331 | 274 | 4 | 1.0 | 247 ± 10 | |
| 3A | 3-galloylquinic acid | 343 | 274 | 4 | 1.0 | 107 ± 4 | |
| 3B | 4-galloylquinic acid | 343 | 274 | 4 | 1.0 | 150 ± 4 | |
| 3C | 5-galloylquinic acid (theogallin) | 343 | 274 | 4 | 1.0 | 1890 ± 76 | |
| 4 | gallic acid | 169 | 274 | 4 | 1.0 | 219 ± 9 | 219 ± 9 |
| 6 | stricitinin isomer | 633 | 274 | 4 | 3.0 | 30.0 ± 1.2 | |
| 7 | digalloylglucose | 483 | 274 | 4 | 2.0 | 46.7 ± 1.9 | |
| 8 | digalloylglucose | 483 | 274 | 4 | 2.0 | 35.4 ± 1.4 | |
| 10 | stricitinin isomer | 633 | 274 | 4 | 3.0 | 25.1 ± 1.0 | |
| 11 | digalloylglucose | 483 | 274 | 4 | 2.0 | 133 ± 5 | |
| 13 | stricitinin | 633 | 274 | 4 | 3.0 | 999 ± 37 | |
| 14 | trigalloylglucose | 635 | 274 | 4 | 3.0 | 97.8 ± 3.9 | |
| 17 | trigalloylglucose | 635 | 274 | 4 | 3.0 | 48.8 ± 2.0 | |
| 18 | trigalloylglucose | 635 | 274 | 4 | 3.0 | 172 ± 7 | |
| 20 | trigalloylglucose | 635 | 274 | 4 | 3.0 | 740 ± 30 | |
| 22 | 1,2-digalloyl-4,6-HHDP-glucose | 785 | 274 | 4 | 4.0 | 73.2 ± 2.9 | |
| total tannins and qalloylquinic acids | 5045 ± 202 | ||||||
| 5 | gallocatechin (GC) | 305 | 270 | 1 | 0.3 | 136 ± 5 | 132 ± 5 |
| 9 | epigallocatechin (EGC) | 305 | 270 | 1 | 0.3 | 820 ± 33 | 806 ± 32 |
| 12 | catechin (C) | 289 | 278 | 1 | 1.0 | 20.5 ± 0.8 | 20.5 ± 0.8 |
| 15 | epicatechin (EC) | 289 | 278 | 1 | 1.0 | 67.6 ± 2.7 | 67.6 ± 2.7 |
| 19 | epigallocatechin 3-O-gallate (EGCG) | 457 | 274 | 1 | 3.1 | 9971 ± 399 | 9950 ± 398 |
| 23 | gallocatechin 3-O-gallate (GCG) | 457 | 274 | 1 | 3.1 | 683 ± 27 | 675 ± 27 |
| 25 | epicatechin 3-O-gallate (ECG)* | 441 | 274 | 1 | 3.8 | 4346 ± 174 | 4315 ± 173 |
| 26 | gallocatechin 3,5-di-O-galltate* | 609 | 274 | 1 | 5.9 | 217 ± 9 | |
| 27 | epigallocatechin 3,5-di-O-galltate | 609 | 274 | 1 | 5.9 | 363 ± 16 | |
| 28 | catechin 3-O-gallate (CG) | 441 | 274 | 1 | 3.8 | 173 ± 7 | 170 ± 7 |
| 29 | epiafzelechin 3-O-gallate (EAG) | 425 | 274 | 1 | 3.8 | 638 ± 26 | |
| total catechins | 17436 ± 697 | ||||||
| 16 | procyanidin B2 (19.95/12.96) | 577 | 278 | 1 | 2.0 | 11.6 ± 0.5 | 11.6 ± 0.5 |
| 21 | theasinensin A or D [EGCG-(2′→2′)-EGCG] | 913 | 278 | 1 | 6.2 | 212 ± 8 | |
| 24 | catechin-(4α→8)-epicatechin 3-O-gallate | 729 | 278 | 1 | 4.8 | 130 ± 5 | |
| total proanthocyanidins | 354 ± 14 | ||||||