Figure 1.
HSQC 2D-NMR spectra of untreated Kraft lignin. (a) whole spectrum, δC/δH 0.0–150.0/0.0–9.0; (b) aliphatic oxygenated region, δC/δH 45.0–95.0/2.5–6.0 ppm; (c) aromatic region, δC/δH 90.0–150.0/5.0–9.0 ppm.
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