Figure 8From: Ultra-structural mapping of sugarcane bagasse after oxalic acid fiber expansion (OAFEX) and ethanol production by Candida shehatae and Saccharomyces cerevisiaeSecond derivative of the NIR spectra (7200 to 4000 cm–1) of native sugarcane bagasse (black online), pre-treated bagasse with oxalic acid (red online) and enzymatic hydrolyzed bagasse (blue online). In the OAFEX-SB, spectral region 6000 to 5920 cm–1 is assigned to the C-H stretching vibration of aromatics due to the re-localization of lignin. Changes in the polysaccharide content after OAFEX and enzyme hydrolysis at regions around 6300, 5208, 4813, 4285, and 4405 cm–1.Back to article page