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Supplementary information for the paper : Chemical and morphological characterization of sugarcane bagasse submitted to delignification process for enhanced enzymatic digestibility

Diffuse Reflectance Fourier Transformed Infrared (DRIFT) spectroscopy is an excellent tool for chemical analysis of lignocellulosic biomass, since it is non-destructive and requires minimal sample preparation. It is also a fast and direct technique that has been employed to reduce base-line errors caused by light scattering [1]. DRIFT spectra of untreated sugarcane bagasse and of samples treated with different NaOH concentrations are shown in Figure A1. Table A1 shows a summary of the main peaks (numbered from 1 to 14 on the untreated bagasse spectrum in Figure A1) and their respective assignments, whose determination was based on published data [2-5]. Due to biomass complexity, most of the spectral bands have contributions from its three major components (lignin, cellulose and hemicelluloses).