| | Signal (cm−1) | Functional group | Maximum of the signal (cm−1) | | LA | LLN-HCl | LLN-CH3COOH | LLN-H3PO4 |
| | 3440–3430 | ν O–H (hydrogen bonding) | 3408,0 | 3440,0 | 3439,6 | 3438,1 | 2940–2930
2689–2880 | ν C–H aliphatic (groups CH and CH2)
ν C–H (groups CH3 from OCH3) | 2937,4
(Overlapped) | 2940,3
2846,7 | 2939,0
2847,0 | 2938,0
2846,0 | | 1727–1690 | ν C=O | (Very weak) | 1710,7 | 1710,8 | 1710,9 | | 1647,1 | 1648,1 | 1649,1 | | 1610–1690 | ν C=C aromatic | 1598,9 | 1610,7 | 1608,0 | 1609,8 | | 1505 | γ C–H aromatic on the plane | 1512,1 | 1512,1 | 1510,1 | 1510,0 | | 1458 | γ C–H aliphatic (groups CH or CH2) | 1458,1 | 1460,0 | 1459,0 | 1459,8 | | 1425–1420 | γ C–H aliphatic (groups CH3) | 1429,2 | 1425,3 | 1422,3 | 14245,8 | | 1370–1250 | γ O–H | 1369,4 | 1367,4 | 1367,1 | 1367,5 | | ν C–O (syringyl ring) | 1220,9 | 1218,9 | 1219,0 | 1218,1 | | 1260 | ν C–O (guaiacyl ring) | 1271,0 | 1269,1 | 1269,9 | 1269,9 | | 1160–1140 | ν C–O (secondary alcohol) | 1126,4 | 1120,6 | 1125,6 | 1125,0 | | 1044 | ν C–O (primary alcohol) | 1033,8 | 1033,8 | 1033.8 | 1033.8 | | 844 | γ C–H aromatic outside the plane (wide) | 858,6 | 860,2 | 860,2 | 860,2 | | 620 | ν C–Cl (hydrochloric acid) | — | 615 | — | — |
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