| PCs | Proanthocyanidins |
| MPCs | Monomeric proanthocyanidins |
| DP | Degree of polymerization |
| C | (+)-catechin |
| EC | (−)-epicatechin |
| CG | (+)-catechin-3-O-gallate |
| ECG | (−)-epicatechin-3-O-gallate |
| OPCs | Oligomeric proanthocyanidins |
| PPCs | Polymeric proanthocyanidins |
| UPLC-MS/MS | Ultra-performance liquid chromatography–tandem mass spectrometry |
| HPLC | High-performance liquid chromatography |
| LC-MS/MS | Liquid chromatography–tandem mass spectrometry |
| ESI | Electrospray ionization |
| MRM | Multiple reaction monitoring |
| mDP | Mean degree of polymerization |
| TIC | Total ion chromatograms |