Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 3503, 11120, Belgrade, Serbia.
Bioprocess Biosyst Eng. 2011 Sep;34(7):803-10. doi: 10.1007/s00449-011-0530-2. Epub 2011 Feb 24.
The objective of this paper was the investigation of a suitable Sepabeads(®) support and method for immobilization of lipase from Candida rugosa. Three different supports were used, two with amino groups, (Sepabeads(®) EC-EA and Sepabeads(®) EC-HA), differing in spacer length (two and six carbons, respectively) and one with epoxy group (Sepabeads(®) EC-EP). Lipase immobilization was carried out by two conventional methods (via epoxy groups and via glutaraldehyde), and with periodate method for modification of lipase. The results of activity assays showed that lipase retained 94.8% or 87.6% of activity after immobilization via epoxy groups or with periodate method, respectively, while glutaraldehyde method was inferior with only 12.7% of retention. The immobilization of lipase, previously modified by periodate oxidation, via amino groups has proven to be more efficient than direct immobilization of lipase via epoxy groups. In such a way immobilized enzyme exhibited higher activity at high reaction temperatures and higher thermal stability.
本文旨在研究一种合适的 Sepabeads(®)载体和方法用于固定假丝酵母脂肪酶。使用了三种不同的载体,两种带有氨基,(Sepabeads(®)EC-EA 和 Sepabeads(®)EC-HA),其间隔长度不同(分别为两个和六个碳原子),另一种带有环氧基(Sepabeads(®)EC-EP)。通过两种常规方法(通过环氧基团和戊二醛)和过碘酸盐方法对脂肪酶进行固定化。活性测定结果表明,通过环氧基团或过碘酸盐方法固定化后,脂肪酶保留了 94.8%或 87.6%的活性,而戊二醛方法的保留率仅为 12.7%。通过过碘酸盐氧化修饰的脂肪酶通过氨基的固定化比通过环氧基团的直接固定化更有效。以这种方式固定化的酶在高温下表现出更高的活性和更高的热稳定性。