| Compound number | Retention time | UV (nm) | MS− (m/z, %) | MS+ (m/z, %) | Proposed characterization | References | Presence/absence in “jurema” propolis |
| 1 | 35.2 | 260, 365 | 301 [M − H]− | 303 [M + H]+ | Quercetin | Comparison with standard | + | 2 | 38.2 | 260, 365 | 315 [M − H]− | 339 [M + Na]+, 317 [M + H]+, 302 (100) | Quercetin methyl ether | [19, 21] | + | 3 | 39.6 | 270, 365 | 315 [M − H]− | 339 [M + Na]+, 317 [M + H]+, 197 (100) | Trihydroxy-dimethoxy chalcone | [17–19, 22] | + | 4 | 41.0 | 260, 360 | 285 [M − H]− | 287 [M + H]+ | Kaempferol | Comparison with standard | − | 5 | 42.4 | 260, 360 | 299 [M + H]− | 323 [M + Na]+, 301 [M + H]+, 286 (100) | Kaempferol methyl ether | [19, 21] | + | 6 | 43.0 | 250, 270sh, 365 | 329 [M − H]− | 353 [M + Na]+, 331 [M + H]+, 316 (100) | Dihydroxy-trimethoxy chalcone | [19, 21] | + | 7 | 44.4 | 255, 355 | 313 [M − H]− | 337 [M + Na]+, 315 [M + H]+, 300 (60), 282 (100) | Kaempferol dimethyl ether | [19, 21] | + | 8 | 45.1 | 370 | 315 [M − H]− | 317 [M + H]− | Uncharacterized chalcone | — | − | 9 | 45.6 | 255, 355 | 329 [M − H]− | 353 [M + Na]+, 331 [M + H]+ | Quercetin dimethyl ether | [19, 21] | + | 10 | 47.1 | 255, 355 | 327 [M − H]− | 329 [M + H]+ | Uncharacterized flavonol | — | − | 11 | 48.3 | 260, 360 | 271 [M − H]− | 273 [M + H]+ | Trihydroxy flavonol | [19, 21] | − | 12 | 50.2 | 270, 340 | 329 [M − H]− | 331 [M + H]+ | Trihydroxy-dimethoxy flavone | [19, 21] | − | 13 | 52.2 | 370 | 269 [M − H]− | 271 [M + H]+, 161 (100), 137 (70) | Methoxy-dihydroxy chalcone | [17–19, 22] | + | 14 | 56.6 | 370 | 299 [M − H]− | 301 [M + H]+, 167 (100) | Dimethoxy-dihydroxy chalcone | [17–19, 22] | + | 15 | 58.5 | 370 | 313 [M − H]− | 315 [M + H]+ | Hydroxy-trimethoxy chalcone | [17–19, 22] | − | 16 | 59.9 | 270, 340 | 343 [M − H]− | 367 [M + Na]+, 345 [M + H]+ | Dihydroxy-trimethoxy flavone | [17–19, 22] | + |
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