Fig. 4

Lignin content and S/G ratio of the starting biomass and of the solid residues recovered after C. thermocellum CBP bioconversion. A Total lignin, B S lignin, C G lignin, D H lignin content, and E S/G ratio and F C5:C6 ratio. Data are mg recovered from the starting biomass or mg recovered from the solid residues from poplar biomass after CBP bioconversion with C. thermocellum over 120 h compared to fermentation controls. Statistical analysis was by one-way analysis of variance (ANOVA) followed by Fisher’s method. Mean ± SD, significant P values are expressed as *P < 0.05, **P < 0.01