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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

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

Samples β–O–4 Resinol (β–β′) Phenylcoumaran Spirodienone (β–1′, α–O–α′) S/G
β–5′ α–O–4′
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