Abstract
AbstractJapanese beech was treated with two-step hot compressed water (first step, 230°C/10 MP/15 min: second step; 270°C/10 MP/15 min) and obtained various cellulose-derived compounds in the second step with relatively high molecular weights were characterized by MALDI-TOF/MS. As a result, cellulose-derived products such as cello-triose, cello-tetraose, cello-pentaose, cello-hexaose, cello-heptaose, cello-octaose, and cello-nonaose, and their dehydrated compounds were identified. In spite of the fact that for these cellulose-derived products, supercritical water treatment in our previous study resulted in the dehydration and fragmentation reactions at the reducing end, two-step hot-compressed water treatment resulted only in dehydration reaction. This suggests that hot-compressed water treatment would be milder than that of supercritical water. These results indicate further that the MALDI-TOF/MS is a powerful tool to analyze the molecular structures of hydrolyzed oligosaccharides and evaluate decomposition pathway of lignocellulosics as treated with hot-compressed water.KeywordsCello-oligosaccharidesHot-compressed waterJapanese beechMALDI-TOF/MS
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