Characterization of lignin derived from water-only and dilute acid flowthrough pretreatment of poplar wood at elevated temperatures

Table 2 Relative proportions of major structural linkages and S, G, and H percentages in ball-milled lignin and flowthrough-derived RISL; A: RISL collected at 240 °C, 25 ml/min, 10 min, with 0.05 % (w/w) H₂SO₄; B: 270 °C, 25 ml/min, 10 min, with water-only

Samples	β–O–4	Resinol (β–β′)	Phenylcoumaran		Spirodienone (β–1′, α–O–α′)	S/G
Samples	β–O–4	Resinol (β–β′)	β–5′	α–O–4′	Spirodienone (β–1′, α–O–α′)	S/G
Ball-milled	73.07	10.71	3.81	12.01	0.40	0.602
A	46.57	8.18	5.72	8.88	0.00	0.674
B	49.38	8.19	5.94	8.49	0.00	0.669

ISSN: 2731-3654