Maize hull hemicelluloses can be extracted almost quantitatively by simple water treatment ("prehydrolysis") in a flow reactor at 165-180°C. Severe decomposition of pentosans is thus avoided. Concomitant solubilized starch can be separated from hemicelluloses by degradation with glucoamylase as was shown on an analytical scale. The obtained xylan (yields around 25%) is partly depolymerized and about 50% of original arabinose present in the side chains are split of. Nevertheless the isolated p r o d g , which is well soluble in water, is still highly branched and shows a DP, of 37 t o 54. Abbau von Maisschalen mit Wasser in einem Strbrnungsreaktor.Die Hemicellulosen von Maisschalen konnen durch einfache Behandlung mit Wasser bei 165-180°C (.,Vorhydrolyse") in einem Stromungsreaktor fast quantitativ ohne gravierende Zersetzung der Pentosane isoliert werden. Ebenfalls geloste Starke kann durch enzymatischen Abbau mit Amyloglucosidase von den Hemicellulosen abgetrennt werden, wie in analytischem MaRstab gezeigt wurde. Das in Ausbeuten um 25% erhaltene Xylan ist teilweise depolyrnerisiert und erhalt nur noch etwa 50% der urspriiglich in den Seitenketten vorhandenen Arabinose. Gleichwohl ist das isolierte ProduktLas sehr gut wasserloslich ist, noch stark verzweigt und weist einen DP, von 37-54 auf.
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