Abstract
The chemical changes in various morphological regions of Japanese beech (Fagus crenata) upon treatment with the ionic liquid 1-ethyl-3-methylimidazolium chloride ([C2mim][Cl]), which preferentially dissolves cellulose, have been investigated by Raman microscopy. The reactivity of polysaccharides and lignin with [C2mim][Cl] differed depending on the types of wood tissues. Chemical components in parenchyma cells showed higher resistance to degradation upon [C2mim][Cl] treatment than wood fiber and vessel. In addition, the lignin structure was partially degraded or modified by [C2mim][Cl] treatment, and its binding mode was complicated; nevertheless, lignin was stable in [C2mim][Cl].
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