Table 2.

¹H NMR peak assignment of sugarcane bagasse lignin extracted with [EMIM]oAc

Signal (ppm)	Functional group
1–1.5	Proton in aliphatic acetate
0.7–0.9	Aliphatic contaminants
2.2–2.6	Proton in aromatic acetate
3.2–3.4	Hβ in β–β structure
3.4–4	Methoxyl proton
4.1–4.6	Hγ in β-O-4 aryl ether
4.8	Hβ in β-O-4 aryl ether
5.3–5.8	Hβ in benzyl aryl ether
6.6	Aromatic H in syringyl unit
6.7–6.9	Aromatic H in guaiacyl unit
7.3–7.6	Ethylenic and aromatic protons in p-coumaric and ferulic acids