Table 4.

Monomeric ratios and ratios of inter-unit linkages of the isolated acidolysis lignins from Iroko (AL-IR) and Iroko–Norway spruce (AL-IRNS), estimated on base of the cross-peaks integrals of the respective 2D NMR spectra.

Lignin Fraction	Monomeric Ratio (%)			S/G Ratio	Inter-Unit Linkages (%)					CA End Groups (%)
	S	G	H		β-O-4′	β-5′	β-β′	BE	DBDO
AL-IR	44	51	5	0.86	74	15	5	4	2	2
AL-IRNS	22	75	3	0.30	71	19	4	2	4	2