Regioselective Hydrolysis of Different Peracetylated β-Monosaccharides by Immobilized Lipases from Different Sources. Key Role of The Immobilization
作者:Jose M. Palomo、Marco Filice、Roberto Fernandez-Lafuente、Marco Terreni、Jose M. Guisan
DOI:10.1002/adsc.200700055
日期:2007.8.6
The effect of the immobilization strategy on the activity, specificity and regioselectivity of three different lipases [those from Thermomyces lanuginose (TLL), Aspergillus niger (ANL) and Candida antarctica B (CAL-B)] in the hydrolysis of peracetylated β-monosaccharides has been evaluated. Three very different immobilization strategies were utilized, covalent attachment, anionic exchange and interfacial
固定化策略对三种不同脂肪酶[来自嗜热单胞菌(TLL),黑曲霉(ANL)和南极假丝酵母(CAL-B)的脂肪酶)的活性,特异性和区域选择性的影响在水解过乙酰化的β-单糖中具有被评估。使用了三种非常不同的固定策略:共价连接,阴离子交换和疏水载体上的界面活化。固定有辛基-TLL的制剂是水解1,2,3,4,6-戊-O-乙酰基-β-D-吡喃半乳糖最有效的生物催化剂,特别是产生6-羟基-1,2,3,4 -四-O-乙酰基-β-D-吡喃半乳糖的总收率为95%,而CNBr-TLL的制备速度要慢48倍,并且对异头位置具有区域选择性,产生70%收率的1-羟基衍生物。固定化PEI-TLL的制剂是最有效的催化1,2,3,4,6-戊基-O-乙酰基-β-D-吡喃葡萄糖的水解反应,使我们可以获得多达70%的6-羟基产物。在2-乙酰氨基-2-脱氧-1,3,4,6-四-O-乙酰基-β-D-吡喃葡萄糖的水解中,辛基-CALB制剂对于生产单羟基产物根本没有选择性。