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Molecular ions and some significant fragments of main catechins presented in GTE.
| Compound | MW | [M − H]− | Significant fragments |
|---|---|---|---|
| Catechin (C) | 290 | 289 | |
| Epicatechin (EC) | 290 | 289 | |
| Gallocatechin (GC) | 306 | 305 | |
| Epigallocatechin (EGC) | 306 | 305 | |
| Epicatechin gallate (ECG) | 442 | 441 | m/z 271 (EC without H2O) m/z 289 (EC) |
| Epigallocatechin gallate (EGCG) | 458 | 457 | m/z 287 (EGC without H2O) m/z 305 (EGC) |
