Binding Sites of Carbohydrate Moieties toward Lignin in “Lignin–Carbohydrate Complex” from Pinus densiflora Wood

Abstract Partially enzyme-degraded lignin–carbohydrate complex (LCC) was subjected to acetylation, followed by oxidation with 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ), which is comfirmed to decompose α - and conjugated γ-ether to release the corresponding alcohol. Methylation analysis of the liberated sugar acetates showed that glucomannan preferably binds to lignin at C-6 position of mannose and glucose residues and that arabinoglucuronoxylan at C-2 and C-3 position of xylose.