Table 1.
Fourier transform-Raman frequencies (cm−1) of orientated macromolecules in the outer epidermal cell walls
| Frequency (cm−1) | Contributor* | Band assignment |
|---|---|---|
| 1630 | L (=) | Ring conjugated C=C stretch of coniferaldehyde |
| 1601 | L (=) | Aryl ring stretching, symmetric |
| 1456 | C (+) | CH2 bending vibration |
| 1377 | C (+) | CH2 bending vibration |
| 1335 | C (+) | CH2 bending vibration |
| 1267 | L (=) | Guaiacyl ring breathing, Caryl–O stretching |
| 1230 | L (=) | Caryl–O stretching |
| 1153 | X (=) | The breathing vibration of the glucopyranose rings |
| 1095 | C (=) | Asymmetric COC stretching |
| 1045 | X (=) | C–C and C–O stretching |
*Orientation: (=), parallel; (+) perpendicular. C, cellulose; X, xylan; L, lignin.