Table 3.
Phenolic acids identified in three polyphenol-rich extracts from Chilean propolis by LC-MS.
| Compound | CEP1 | CEP2 | CEP3 | Retention time | MW | Main fragments |
|---|---|---|---|---|---|---|
| Caffeic acid | + | + | + | 15.3 | 180 | 135, 105 |
| CAPE | + | + | + | 41.8 | 284 | 139, 135 |
| Chlorogenic acid | N.D. | + | + | 30.9 | 354 | 191, 161 |
| P-coumaric acid | + | + | + | 16.7 | 164 | 119, 104 |
| Ferulic acid | + | + | + | 34.5 | 194 | 178, 134 |
| Gallic acid | + | N.D | N.D | 8.5 | 170 | 125, 107 |
CEP1, CEP2, and CEP3: polyphenol-rich extracts from Chilean propolis collected in 2008, 2010, and 2011, respectively. CAPE: caffeic acid phenethyl ester; + indicates presence; N.D.: not detected.