Production of hydroxamic acids by immobilized Pseudomonas aeruginosa cells: Kinetic analysis in reverse micelles
作者:Marisa Bernardo、Rita Pacheco、Maria Luísa M. Serralheiro、Amin Karmali
DOI:10.1016/j.molcatb.2013.03.016
日期:2013.9
kinetic constants for the transamidation reaction in hydroxamic acids synthesis, were determined using substrates such as aliphatic, amino acid and aromatic amides and esters, in both media. In reverse micelles, Km values decreased 2–7 fold relatively to the free biocatalyst using as substrates acetamide, acrylamide, propionamide and glycinamide ethyl ester. We have concluded that overall the affinity of
来自铜绿假单胞菌菌株L10的含有酰胺酶的完整细胞被用作游离和固定在反胶束系统中的生物催化剂。在两种介质中,使用诸如脂肪族,氨基酸,芳香族酰胺和酯等底物,确定了异羟肟酸合成中氨基转移反应的表观动力学常数。反胶束,K m相对于以乙酰胺,丙烯酰胺,丙酰胺和甘氨酰胺乙酯为底物的游离生物催化剂,该值降低了2-7倍。我们已经得出结论,当在相反的胶束系统(而不是缓冲液系统)中进行反应时,生物催化剂对每种底物的亲和力总体上会增加。相对于游离形式,固定化的生物催化剂通常在较低的底物浓度下显示出更高的稳定性和更快的反应速率,这是有利的。另外,固定化显示适合于获得最高产率的异羟肟酸衍生物,在某些情况下高于80%。