<Original>Microwave Irradiation of Lignocellulosic Materials : IV. Enhancement of Enzymatic Susceptibility of Microwave-irradiated Softwoods

Abstract

この論文は国立情報学研究所の学術雑誌公開支援事業により電子化されました。Effect, of microwave irradiation on the enzymatic susceptibility of various softwoods was investigated. The pH values of the reaction liquor dropped with increasing temperature to 2.9-3.3 at 230℃, consistent with increase in acidity (0.5-0.85 meq at 230-239℃). Above approximately 180℃, hemicellulose underwent acid-mediated autohydrolysis and became water-soluble yielding a mixture of oligosaccharides and monosaccharides. The composition of water-soluble portion was similar for all wood species tested. The maximum extents of saccharification below 240℃ ranged between 36-62% for softwoods, while those for hardwoods were between 88-93%. The present investigation confirmed that microwave pretreatment enhanced the enzymatic susceptibility of various softwoods. However, further attempt should be needed to give higher values equal to those for hardwoods