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. 2010 Oct 20;11(10):4035–4050. doi: 10.3390/ijms11104035

Figure 1.

Figure 1

UV spectra of lignins isolated using: (A) conventional alkaline extraction with 1.25 M NaOH at 80 °C for 5 h; (B) alkaline assisted PLPW extraction with 0.47 M NaOH at 100 °C for 82 min; (C) alkaline assisted PLPW extraction with 0.47 M NaOH at 140 °C for 82 min; (D) alkaline assisted PLPW extraction with 0.47 M NaOH at 180 °C for 82 min; and (E) PLPW extraction with water at 180 °C for 82 min.