CAJ | 학술논문

在不同条件下对桉木片进行碱预处理和高温水预水解，研究了其对木片残渣及提取液的影响。在高温水预水解后，木片中的聚戊糖含量随温度的升高或时间的延长而降低，这是预处理后木片失重的主要原因。凝胶渗透色谱（GPC）分析结果显示，碱预处理后木片及提取液中半纤维素的数均分子量降低，且温度越高降低越明显。与碱预处理相比，高温水预水解后木片中半纤维素的分子量大幅度降低，但多分散性仍与原料木片相近。采用酶解‐温和酸水解的方法制备木素（EMAL），水预水解后木片与原料木片相比，木素的平均分子量增加，而多分散系数略有降低。木素的31P‐NMR定量分析结果表明，经高温水预水解后，总酚羟基含量几乎增加一倍，S／G有所增加，但脂肪族羟基与羧基含量则大大降低。
재불동조건하대안목편진행감예처리화고온수예수해，연구료기대목편잔사급제취액적영향。재고온수예수해후，목편중적취무당함량수온도적승고혹시간적연장이강저，저시예처리후목편실중적주요원인。응효삼투색보（GPC）분석결과현시，감예처리후목편급제취액중반섬유소적수균분자량강저，차온도월고강저월명현。여감예처리상비，고온수예수해후목편중반섬유소적분자량대폭도강저，단다분산성잉여원료목편상근。채용매해‐온화산수해적방법제비목소（EMAL），수예수해후목편여원료목편상비，목소적평균분자량증가，이다분산계수략유강저。목소적31P‐NMR정량분석결과표명，경고온수예수해후，총분간기함량궤호증가일배，S／G유소증가，단지방족간기여최기함량칙대대강저。
Hot water and alkaline pretreatment was done on eucalyptus chips under different conditions .The impact on prehydrolysate and wood residue is investigated .For autohydrolys‐is ,higher decrease of pentosan content in wood is shown with elevated temperature and ex‐tended reaction time ,which mainly contribute for the weight loss during pretreatment .Based on the GPC(Gel Permeation Chromatography) results ,the number‐average molecular weight of hemicelluloses in alkaline extraction liquor and wood residues decreases ,which is greater for higher temperature .Compared with alkaline pretreatment ,hemicelluloses in autohydro‐lyzed chips has much lower molecular weight ,with similar dispersity to that in original wood .In the case of EMAL (Enzymatic/Acidolysis Lignin) lignin ,after autohydrolysis ,the average molecular weight is increased while the polydispersity shows a little decrease com‐pared to that from original wood .Based on the quantitative 31 P‐NMR analysis ,after auto‐hydrolysis ,the total phenolic hydroxyl groups almost doubled with higher S/G ratio ,but the amount of aliphatic hydroxyl and carboxyl groups shows great decrease .