Fig. 1
Analysis of sugarcane bagasse composition. a Solid-state nuclear magnetic resonance spectra of sugarcane bagasse prior and after microbial growth. Regions 1 and 1′ are assigned to the C1 carbon of cellulose (103–106 ppm) and to C4 carbon of crystalline cellulose (86–92 ppm). Regions 2 and 2′ are assigned to C1, C2, and C4 aromatic carbons of lignin (123–142 ppm) and to aryl methoxyl carbons of lignin (50–56 ppm). Regions 3 and 3′ are assigned to C1 carbon of hemicellulose and to CH3 in acetyl groups of hemicelluloses. The relative abundance of cellulose, hemicellulose, and lignin was estimated from regions 1, 1′, 2, 2′, 3, and 3′. b–e Confocal images of sugarcane bagasse lignin prior and after microbial growth. f Corresponding average emission spectra