Table 1.
Assignment of different components of the cuticle. Wavenumbers derived from NMF
| Wavenumber (cm−1) | Assignment | ||
|---|---|---|---|
| Wax | Cutin | CaOx | |
| 1734 | 1723 | ν C=O (fatty acid esters) | |
| 1712 | 1707 | ν C=O (coumaric acid, midchain carbonyls) | |
| 1654 | ν C=C (anthoxanthins) | ||
| 1632 | 1634 | ν C=C (coumaric acid, stilbenes); Φ8 (anthoxanthins) | |
| 1607 | 1607 | Φ8 (all rings) | |
| 1570 | ν C=O (anthoxanthins) | ||
| 1488 | ν C=O (Calcium oxalate) [107] | ||
| 1463 | ν C=O (Calcium oxalate) [107] | ||
| 1455 | δ C–H (aliphatic chains) [57] | ||
| 1441 | 1440 | δ C–H (aliphatic chains) [57] | |
| 1423 | δ C–H (aliphatic chains) [57] | ||
| 1372 | γw CH2 (aliphatic chains) [57] | ||
| 1362 | Φ20a (anthoxanthins(A-ring)) | ||
| 1308 | γt CH2 (aliphatic chains) [57] | ||
| 1295 | γt CH2 [57] | ||
| 1201 | 1205 | Φ7a (coumaricacid) | |
| 1177 | Φ9a (anthoxanthins with p-subst. C-Ring) | ||
| 1169 | Φ9a (coumaric acid) | ||
| 1123 | ν C–C (aliphatic chains) | ||
| 1112 | |||
| 1077 | ν C–C (aliphatic chains) | ||
| 1062 | 1066 | ν C–C (aliphatic chains) | |
| 1001 | Φ12 (stilbenes) | ||
| 921 | ν C–C (aliphatic chains) | ||
| 895 | νs C–C + δ O–C=O (Calcium oxalate) [107] | ||
| 864 | 870 | 864 | ν C–C + γr CH2 (aliphatic chains) [108]; (Calcium oxalate) |
| 831 | ν C–C + γr CH2 (aliphatic chains) [108] | ||
| 738 | (Kaempferol) | ||
| 710 | |||
| 653 | |||
| 642 | 642 | Φ6a (anthoxanthins (A-ring)) | |
| 593 | Water libration (Calcium oxalate) [107] | ||
| 582 | Φ1 (anthoxanthins (A-ring)) | ||
| 524 | 520 | ν Ca-O + ν C–C (Calcium oxalate) [107] | |
| 518 | Φ6b (anthoxanthins (A-ring)) | ||
| 503 | |||
| 418 | 414 | ||
ν: stretching; δ: bending; γt: twisting; γr: rocking, γw: wagging; Φ: ring mode in Varsanyi notation [59]