Fig. 3
From: A new approach to recycle oxalic acid during lignocellulose pretreatment for xylose production
FTIR spectra of untreated and residual corncob. a: Untreated corncob, b pretreatment at 130 °C for 1.0 h using 100 mmol/L oxalic acid solution, c: pretreatment at 140 °C for 2.5 h using 100 mmol/L oxalic acid solution, d: pretreatment at 150 °C for 2.5 h using 100 mmol/L oxalic acid solution, e: pretreatment at 140 °C for 2.5 h using 10 mmol/L oxalic acid solution, f: pretreatment at 140 °C for 2.5 h using 200 mmol/L oxalic acid solution