Table 1.

Functional group (³¹P NMR) and nitrogen (CHNS analysis) content of lignin ¹ and tannin.

Lignin/Tannin	Carboxyl, mmol/g	Aliphatic Hydroxyl, mmol/g	Phenolic Hydroxyl by Subtype (Lignins Only), mmol/g			Total Phenolic Hydroxyl, mmol/g	Amino, mmol/g	N, %
			Condensedor syringyl	Guaiacyl	p-OH-phenyl
HW kraft lignin	0.29 ± 0.00	0.95 ± 0.02	2.62 ± 0.09	0.80 ± 0.02	0.11 ± 0.09	3.53 ± 0.13		0.12 ± 0.00
N-modified HW kraft lignin	0.30 ± 0.09	1.02 ± 0.04	2.77 ± 0.02	0.29 ± 0.01	0.02 ± 0.02	2.58 ± 0.05	1.47 ± 0.21	10.12 ± 0.05
Spruce tannin 3	1.13 ± 0.02	2.01 ± 0.06				3.49 ± 0.15		0.57 ± 0.01
N-modified spruce tannin 2								10.61 ± 0.02
Tanfloc SG								7.60 ± 0.02

¹ For data on N-modified and unmodified softwood (SW) kraft and SW CatLignin, see [10]; ² insoluble in NMR solvent—spectrum unable to be recorded; ³ tannin content 60%.