蒸汽爆破预处理对沙柳组成及纤维结构性能影响研究

Study on composition,cellulosic structure and property of steam-exploded Salix psammophila stalk

研究了蒸汽爆破维压时间对沙柳茎杆化学组成和酶解糖化率的影响,并采用扫描电镜(SEM)、X射线衍射仪和红外光谱(IR)对沙柳纤维物理形态、结构和性能进行了表征。结果表明蒸汽爆破处理对纤维素、木质素含量影响不显著,而半纤维素含量大幅度降低。蒸汽爆破预处理后沙柳纤维表面和细胞壁受到不同程度的破裂,蒸汽爆破纤维素表观结晶度比原料纤维素有所提高,但其绝对结晶度降低。酶解糖化反应温度46℃、反应时间72 h、酶用量20 FPU/(g纤维素)和底物浓度为2.0%时,沙柳茎杆原料酶解糖化率为14.5%,蒸汽爆破维压4 min处理的沙柳物料糖化率达到69.81%,纤维素糖化率提高4.4倍,蒸汽爆破是一种有效的木质纤维预处理方法。

The effect of steam explosion time on composition and enzymatic hydrolysis rate of cellulosic residue are presented for steam-explosion pretreatment of Salix psammophila stalks,which fiber physical feature,structure and property are studied by Scanning Electron Microscope(SEM),Infrared(IR) and X-rays diffraction spectrum methods.No significant difference in cellulose and lignin content,but hemicellulose content is largely degraded,enhanced with steam explosion time increasing.Steam explosion pretreatment ca...