title: Effect of ionic liquid treatment on the ultrastructural and topochemical features of compression wood in Japanese cedar (Cryptomeria japonica).
abstract: The morphological and topochemical changes in wood tissues in compression wood of Japanese cedar (Cryptomeria japonica) upon treated with two types of ionic liquids, 1-ethyl-3-methylimidazolium chloride ([C2mim][Cl]) and 1-ethylpyridinium bromide ([EtPy][Br]) were investigated. Compression wood tracheids were swollen by both ionic liquids but their swelling behaviors were different in the types of ionic liquids used. Under the polarized light, we confirmed that crystalline cellulose in compression wood is amorphized by [C2mim][Cl] treatment whereas it changes slightly by [EtPy][Br] treatment. Raman microscopic analyses revealed that [C2mim][Cl] can preferentially liquefy polysaccharides in compression wood whereas [EtPy][Br] liquefy lignin. In addition, the interaction of compression wood with ionic liquids is different for the morphological regions. These results will assist in the use of ionic liquid treatment of woody biomass to produce valuable chemicals, bio-fuels, bio-based composites and other products.
authors.affiliation: Department of Wood Improvement, Forestry and Forest Products Research Institute, Tsukuba, Japan.|Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, Kyoto, Japan.
authors.forename: Toru
authors.initials: T
authors.lastname: Kanbayashi
authors.affiliation: Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, Kyoto, Japan.
authors.forename: Hisashi
authors.initials: H
authors.lastname: Miyafuji
mesh_terms: D056804:Biofuels; D018533:Biomass; D002482:Cellulose / Q000378:metabolism; D032485:Cryptomeria / Q000187:drug effects* / Q000378:metabolism; D007093:Imidazoles / Q000494:pharmacology; D052578:Ionic Liquids / Q000494:pharmacology*; D007477:Ions / Q000494:pharmacology; D008031:Lignin; D055585:Physical Phenomena; D011134:Polysaccharides / Q000378:metabolism; D011726:Pyridinium Compounds / Q000494:pharmacology; D014934:Wood / Q000187:drug effects* / Q000378:metabolism
chemical_list: D056804:Biofuels; D007093:Imidazoles; D052578:Ionic Liquids; D007477:Ions; D011134:Polysaccharides; D011726:Pyridinium Compounds; C011815:ethylpyridinium; D002482:Cellulose; D008031:Lignin; C518739:1-ethyl-3-methylimidazolium