Evaluating Lignin-Rich Residues from Biochemical Ethanol Production of Wheat Straw and Olive Tree Pruning by FTIR and 2D-NMR

Figure 2

HSQC 2D-NMR spectra, 0–150/0–9 ppm region, of the lignin-rich residues from wheat straw (a) and olive tree pruning (b) WIS fractions. The aliphatic, oxygenated aliphatic, and aromatic region are observed. Cross signals of the residual DMSO and protein residue (Pr) are indicated.

(a)

(b)