Table 2.
Phenolic Compound | Chemical Structure | RT (min) | λmax (nm) |
---|---|---|---|
Gallic acid | 5.9 ± 0.1 | 272 | |
(+)-Catechin | 16.3 ± 0.4 | 279 | |
Quercetin | 41.6 ± 0.3 | 369 | |
Quercetin-3-glucuronide * | 28.8 ± 0.3 | 355 | |
Quercetin-3-glucoside * | 28.2 ± 0.3 | 354 | |
Malvidin-3-glucoside | 22.5 ± 0.4 | 526 | |
Anthocyanidin | unknown | 35.8 ± 0.4 | 533 |
trans-Resveratrol | 37.8 ± 0.3 | 306 | |
trans-ε-Viniferin | 44.1 ± 0.2 | 324 |
* Both quercetin-3-glucoside and quercetin-3-glucuronide show similar spectra and retention times, so it was not possible to differentiate them in samples.