| Título: | INFLUENCE OF STEAM PRESSURE ON THE PHYSICO-CHEMICAL PROPERTIES OF DEGRADED HEMICELLULOSES OBTAINED FROM STEAM-EXPLODED LESPEDEZA STALKS |
| Autores: |
Wang, Kun Jiang, Jianxin Xu, Feng Sun, Runcang Baird, Mark S. |
| Fecha: | 2010-04-28 |
| Publicador: | Bioresources |
| Fuente: |
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| Tipo: |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
| Tema: | Steam Explosion; Fractionation of polymers; GPC; Polysaccharides |
| Descripción: | Steam explosion pretreatment was used to release hemicelluloses from the stalks of Lespedeza crytobotrya, a potential woody biomass crop. Hemicelluloses from Lespedeza crytobotrya subjected to five different pretreatment severities were extracted with 60% aqueous ethanol solution containing 1% NaOH, characterized by component analysis, gel permeation chromatography (GPC), FT-IR, NMR spectroscopy, and thermal analysis, and compared with hemicelluloses obtained from untreated stalks. It was found that the hemicellulosic fractions mainly consisted of arabinoxylans and β-glucans or xyloglucans. Steam explosion pretreatment yielded noticeable degradation and debranching reactions, illustrated by a linear decrease of molecular weight and Ara/Xyl ratio with increasing severity. For further high-value utilization of the hemicellulosic polymers, steam explosion at 20 or 22.5 kg/m2 for 4 min is promising because of improved extraction efficiency and avoidance of over-drastic degradation of the polymers. |
| Idioma: | Inglés |