3-2-2 セルロースの低温熱分解における還元性末端の役割(3-2 熱分解2,Session 3 バイオマス等,研究発表)

抄録

Pyrolysis behavior of cellulose was studied at relatively low pyrolysis temperature (below 280℃, under nitrogen). This paper focuses on the reducing end-group in cellulose as a potential reactive site. Number of the reducing end-group could be reduced down to 17% in Avicel PH-101 by heat treatment with glycerol. Thermal glycosylation occured between the reducing end-groups and hydroxyl groups of glycerol. With this glycerol-treated cellulose as a model with less reducing end-groups, influences of the reducing end-groups on color formation and weight-loss behavior were studied. Color formation was significantly inhibited in glycerol-treated cellulose. Initial weight-loss in thermo gravimetric (TG) analysis was also reduced. Thus, these low temperature phenomena were suggested to arise from the reducing end-groups in cellulose. Furthermore, pyrolysis studies of the cellulose - methyl-β-D-glucopyrnoside (Me-β-Glc) mixture implied that the reducing end-groups activate the transglycosylation reactions for Me-β-Glc. This may be involved in the initial weight-loss in TG analysis.