Fig. 1
FTIR spectra of lignin samples. Alkali lignin, sulfonated lignin, oxidized lignin, and carboxylated lignin were expressed as AL, SL, OL, and CL, respectively
Fig. 1 | Biotechnology for Biofuels
FTIR spectra of lignin samples. Alkali lignin, sulfonated lignin, oxidized lignin, and carboxylated lignin were expressed as AL, SL, OL, and CL, respectively