Tran A V, Chambers R P
Chemical Engineering Department, Auburn University, Auburn, Alabama 36849.
Biotechnol Bioeng. 1986 Jun;28(6):811-7. doi: 10.1002/bit.260280606.
Removal and modification of southern red oak hemicelluloses and lignin in a 0.05%(w/v) sulfuric acid hydrolysis were investigated. The hydrolysis profile was to raise the reaction from room temperature to 150 degrees C for in 38 min and to extend the hydrolysis at 150 degrees C for 1 h. At the end of the hydrolysis, 25.5% of red oak components were dissolved, of which 58% was xylose and 17% lignin. As the hydrolysis proceeded from room temperature to 150 degrees C, a part of red oak xylan was removed to yield an oligomer fraction having maximal yield and average molecular weight of 3460 at 150 degrees C. This fraction and the bulk xylan extracted during the first 30 min at 150 degrees C were further degraded to give a lower molecular weight oligomer fraction, of which the yield and average molecular weight (2610) were highest at the end of the bulk removal of xylan. Red oak lignin, syringyl and guaiacyl units in particular, was increasingly removed with the progress of the hydrolysis. Lignin derivatives and a part of red oak extractives soluble in the hydrolysate were identified.
研究了在0.05%（w/v）硫酸水解中南方红橡木半纤维素和木质素的去除及改性情况。水解过程是将反应从室温升至150℃，历时38分钟，并在150℃下延长水解1小时。水解结束时，25.5%的红橡木成分溶解，其中58%为木糖，17%为木质素。随着水解从室温进行到150℃，一部分红橡木木聚糖被去除，在150℃时得到产率和平均分子量为3460的低聚物部分。该部分以及在150℃最初30分钟内提取的大量木聚糖进一步降解，得到较低分子量的低聚物部分，其产率和平均分子量（2610）在大量木聚糖去除结束时最高。红橡木木质素，特别是紫丁香基和愈创木基单元，随着水解的进行被越来越多地去除。鉴定出了木质素衍生物和一部分可溶于水解产物的红橡木提取物。
