ジオキサンリグニンの光酸化-1-被光によるリグニンの化学変化〔木材の光分解-24-〕

概要

論文の詳細を見る
A study was made on photdegradation of dioxane lignin isolated from Hinoki wood meals (Chamaecyparis obtusa). The solution in dioxane was exposed for 30 hours to high pressure mercury lamp through Pyrex glass under current of oxygen at room temperature. Dioxane lignin was not gasified by irradiation, as the weight of solid substance in solution was not changed before and after exposure (Table 3). It was surely depolymerized by irradiation, as in the exposed lignin higher fragments of molecule are less and lower fragments more in comparison with the unexposed one, as shown in Table 4 and in Table 5. It was suggested by UV, IR and NMR spectra (Fig. 1, 2 and 3) that aromatic rings may be cleaved and carboxyl groups produced by irradiation. This photoreaction proceeded similarly in benzene as in dioxane (Table. 7) and was nearly inhibited under current of nitrogen (Table 6). Oxygen could not bring about any reaction without irradiation of light (Fig. 1).
東京大学大学院農学生命科学研究科附属演習林,The Tokyo University Forests,東京大学農学部林産学科,Department of Forest Products, Faculty of Agiculture, University of Tokyo.の論文