| FTMS | fourier transformation mass spectrometry |
| PDA | photodiode array detector |
| AGC | automatic gain control |
| PTFE | polytetrafluoroethylene |
| HCD | high-energy C-trap dissociation |
| FWHM | full width at half maximum |
| a.u. | arbitrary units |
| ESI | electrospray ionization |
| HPLC | high performance liquid chromatography |
| MS | mass spectrometry |
| LC | liquid chromatography |
| 13C-NMR | Carbon-13 nuclear magnetic resonance |
| EC | catechin |
| ECG | catechin gallate |
| EGC | gallocatechin |
| EGCG | gallocatechin gallate |
| QTrap | quadrupole ion trap |
| DP | degree of polymerization |
| QM | quinone methide |
| HRF | heterolytic ring fission |
| RDA | retro-Diels-Alder |
| IMF | Ion molecular formula |
| LC–LTQ-Orbitrap | liquid chromatography coupled with electrospray ionization hybrid linear trap quadrupole-Orbitrap mass spectrometry |
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