Enhanced enzymatic sugar production from corn stover by combination of water extraction and glycerol-assisted instant catapult steam explosion

Bioresources and Bioprocessing

Table 4 Hydroxyl groups of lignins extracted from enzymatic digestion residues (mmol/g lignin)

Water extraction prior to ICSE	G:W	Aliphatic OH	S-OH	G-OH	H-OH	Total phenolic OH (S, G and H)	Carboxylic OH
No	0:5	2.06	0.34	0.41	0.67	1.42	0.83
No	4:1	1.92	0.45	0.55	0.63	1.63	1.04
Yes	0:5	2.47	0.40	0.49	0.76	1.65	0.72
Yes	4:1	2.24	0.47	0.53	0.77	1.77	0.79

G:W = glycerol:water (w/w); S-OH, syringyl OH; G-OH, guaiacyl OH; H-OH, p-hydroxylic phenyl OH