Table 2.
The main bands observed in the FT-Raman spectra of vegetal extracts: hawthorn (HN), red grape skin (RGS) and blueberry (BB) in the 3100–3000 and 1800–400 cm−1 region.
| Attribution | HN | RGS | BB |
|---|---|---|---|
| p-substituted benzene | 3060 m | 3060 m | 3060 m |
| aliphatic esters (νC=O) | 1730 w | 1728 m | |
| fumaric acid, aliphatic ketones (νC=O) |
1694 w | - | 1711 m |
| ν(C=C) allyl derivatives | - | 1642 vs | 1639 vs |
| ν(C=C) aromatic | 1628 vs | 1627 vs | 1628 vs |
| δNH2 + ν(C=C) aromatic | 1604 vs | 1604 sh | 1604 s |
| ν (C=C) aromatic | 1577 sh | ||
| δCH3/CH2 | 1446 m | 1448 m | 1446 m |
| νs COO− δCH3 |
1406 m, sh 1378 m |
1385 m | 1406 m 1387 m |
| νC-O (phenolic) | 1290 m-s 1266 m, sh |
1267 m | 1290 m 1266 m |
| δCH (aromatic) (p-disubstituted benzene)/polyenes | 1180 1154 m |
1154 vs | 1154 m |
| δCH (aromatic) + ν(C-C) aliphatic | 1084 m | 1089 w | 1076 w |
| δCH (aromatic) | 1002 m | 1008 m-s | 1002 m-s |
| δCH (aromatic) + ν(C-C) aliphatic | 947 vw | 926 w | 939 m, l |
| skeletal vibrations | 896 w 873 w |
871 w | 888 w 873 w |
| skeletal vibrations (p-disubstituted benzene) | 795 m-w | 795 m-w | 795 m |
| skeletal vibrations | 681 w | 681 m-w | - |
| skeletal vibrations (benzene p-disubstituted) | 617 w | 618 w | 617 w |
| n-alkanes | 420 w | ||
| δ(CCO) polyphenols and/or resveratrol | 370 m-w | 370 m-w |
s = strong, m = medium, w = weak, v = very, sh = shoulder, l = large.