“…Figure 1 shows the FTIR spectra of pretreated eucalyptus and raw eucalyptus chips. Stretching vibration in the spectra could be assigned to different groups of lignocellulose components: 1594, 1504 and 1273 cm −1 to lignin, 1421, 1319, 1229 and 1106 cm −1 to lignin and carbohydrates, and 3350, 2898, 1735, 1370, 1056 1026, and 892 cm −1 to carbohydrates [24,28,43,44]. The peaks at 1735 and 1229 cm −1 are related to the C=O stretching vibration and C-O stretching vibration in hemicellulose.…”