Structural characterization of lignin from wheat straw

Abstract

Enzyme/mild acidolysis lignin (EMAL) was isolated from wheat straw. The structural characterization of wheat straw EMAL was investigated by FT-IR, 1H NMR, quantitative 31P NMR and DFRC, and DEPT CH (θ=135C) techniques. The wheat straw EMAL was a GSH-lignin with β-O-4 structures and several condensed units (β-5, β-β, β-1, 5-5) and vinyl ether moieties; the contents of DBDO substructures and total β-aryl ether in the wheat straw EMAL were 0.257mmolg1 and 0.818mmolg1, respectively. Meanwhile, the structure features of the hemicelluloses residues attached to lignin were also investigated using DEPT CH (θ=135C) spectra.

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