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Table 2 Sugarcane cell wall vibrational modes and spectral assignments

From: Localization of polyhydroxybutyrate in sugarcane using Fourier-transform infrared microspectroscopy and multivariate imaging

Vibrational mode (cm−1) Spectral assignment
967 Arabinoxylan [26]
991 C–O stretch [35]
1006 C–O and C–C stretch, and CH2 rock in cellulose [36]
1016 Pectin [27]
1026 C–O, C–O–H, C–O–C, C–C, ring stretching vibration in cellulose and hemicellulose [30, 37, 38]
1035 Aromatic C–H in-plane deformation (lignin) [19, 39];
C–C, C–O, C–C–O, C–O–C, C–O–H stretch in cellulose and hemicellulose [19, 37, 40, 41]
1040 C–C, C–O, C–O–C, C–O–H stretching vibration in cellulose and hemicellulose [19, 37]
1053 C–O stretch, C–O, C–C ring [19, 41]
1062 Glycosidic linkage in cellulose [28]
1104 C–O–H, C–O–C, C–C, ring stretching vibration in cellulose [19, 37, 41];
OH band in cellulose and hemicellulose [19, 38, 41]
1110 O–H band in cellulose and hemicellulose (crystalline cellulose); cellulose anti-symmetrical stretch [35]
1123 C–O, C–C stretching in starch [29]
1159 C–C, C–O, C–O–C, C–O–H stretching vibration in cellulose [19, 37, 4042];
Anti-symmetrical bridge oxygen stretching [35]
1173 C–O–C, C–C stretch in xylan [30]
1249 Aryl ring breathing mode; C–O stretch (lignin) [19, 35, 41];
C–O stretch in hemicelluloses [19, 41, 42]
1315 C–H ring, CH2 symmetrical wagging, O–H in-plane bending [19, 35, 42]
1339 O–H in-plane bending and CH in cellulose and hemicellulose [35, 40, 42]
1374 C–H bending in cellulose [35];
C–H, CH2 bending in hemicellulose [19, 41]
1419 CH2 scissoring at C(6) in cellulose [38];
C–H deformation in hemicellulose [19, 41]
1458 O–H in-plane bending in cellulose [35];
CH3 asymmetrical bending (lignin) [19, 39, 41]
1497 Aromatic ring vibration [43]
1509 C=C stretching vibration in aromatic ring of lignin [19, 38, 39, 41]
1541 N–H in amide II [44, 45]
1639 C=C, conjugated or aromatic carbonyl groups [46]
1647 C–O stretching vibration in lignin [41]
1716 C=O stretch in lignin [19]
1722 C=O stretch in lignin [19]
1733 C=O stretching vibration in acetyl groups of hemicellulose [38, 4042]