Table 1.
Chromatographic and spectroscopic data of constituents of an aqueous extract of a sample of Brazilian green propolis from Minas Gerais (Southeast Brazil), obtained by HPLC/ESI/MS
| Peak | Retention time (min) | Relative amount (%) | UV (nm) | [M + H]+ m/z | [M−H]− m/z | Proposed identification |
|---|---|---|---|---|---|---|
| 1 | 14.4 | 1.2 | ND | 355.2 | 353.4 | 3-O-(E)-caffeoylquinic acid |
| 2 | 17.6 | 4.4 | 300 sh, 330 | 355.2 | 353.1 | 5-O-(E)-caffeoylquinic acid |
| 3 | 20.9 | 2.6 | 300 sh, 330 | 355.2 | 353.1 | 4-O-(E)-caffeoylquinic acid |
| 4 | 27.1 | 13.8 | 300 sh, 330 | 521.4 | 519.2 | Didihydrocaffeoylquinic acid |
| 5 | 29.0 | 15.8 | 300 sh, 330 | 517.3 | 515.2 | 3,4-Di-O-(E)-caffeoylquinic acid |
| 6 | 31.5 | 8.0 | 300 sh, 330 | 517.3 | 515.2 | 3,5-Di-O-(E)-caffeoylquinic acid |
| 7 | 32.5 | 27.2 | 330 | ND | 515.2 | 4,5-Di-O-(E)-caffeoylquinic acid |
| 8 | 41.3 | 2.0 | 315 | ND | 231.2 | 4-Hydroxy-3-prenyl-cinnamic acid (drupanin) |
| 9 | 47.0 | 5.0 | 315 | ND | 299.5 | 4-Hydroxy-3,5-diprenyl-cinnamic acid (artepilin C) |
ND: not determined.