Figure 5

CPMASTOSS spectra of the solid fractions of sugarcane bagasse sample submitted to the different pretreatments. (a) hot water; (b) sodium bisulfite; (c) sulfuric acid and (d) sodium hydroxide pretreatments, respectively. Lines 3 and 7: C6 and C4 carbons from amorphous cellulose [38–42]; lines 4 and 8: C6 and C4 carbons [35–37]; lines 2, 11, 12, 13, 14: and 15: lignin carbons [37, 43]; lines, 1, 3, 6, 7, 9 and 17: hemicelluloses carbons [36, 44]; the unmarked line at 39 ppm is due to ash from biomass burned.