Fig. 1
FTIR analysis of xylan free-lignin and original xylan. Infrared spectrum ranging from 1250 cm−1 to 1750 cm−1 to identify the presence or absence of lignin according to each substrate. The green line corresponds to xylan subjected to a second alkaline treatment, where no lignin band can be seen, indicating that the treatment was effective. X1: untreated xylan; X2: xylan treated with 6% H2O2; X3: xylan hydrolyzed with laccase