TABLE 3.

Signal assignments of lignin medium samples in the ¹³C NMR.

δ (ppm)	Assignments	δ (ppm)	Assignments
152.3	C3/C5 in S unit	115.6	C5 in S unit
150–148	C3 in G unit	111.1	C2 in G unit
147.0	C4 in G unit	104.2	C2/C6 in S unit
130.1	C2/C6 in pCA unit	62–75	Interunit linkages
128	C2/C6 in H unit		(β-5, β-β and β-O-4)
119	C6/C5 in G unit	56.5	OCH3 in G and S unit

G, guaiacyl unit; S, syringyl unit; H, p-hydroxyphenyl unit; pCA, esterfied p-coumaric acid.