Fig. 9

FT-IR spectrum of raw and HCR-LccH-pretreated corncob biomass at different time intervals. An increase in transmittance and the corresponding decrease in the depth of the spectrum refers a few bonds to absorb that particular wavelength. Cellulose increase represented by the wavelengths 950 (C–O), 1031 (C–O, C=C, C–C–O stretching) and 1424 (–CH₂ vibration) cm⁻¹, respectively. Strong vibration at 2895 cm⁻¹ showed lignin reduction