Immobilization of lipase onto metal-organic frameworks for
enantioselective hydrolysis and transesterification
Abstract
Enzyme immobilization enhances the catalytic activity and stability of
the enzyme, and also improves reusability. Metal organic frameworks
(MOFs), which possess diversified structures and porosity, have been
used as excellent carriers for enzyme immobilization. Pseudomonas
fluorescens lipase (PFL) has been successfully immobilized onto MOFs by
covalent cross-linking to obtain a series of immobilized lipase
(PFL@MOFs). PFL@MOFs are used for catalytic enantioselective hydrolysis
of 2-(4-hydroxyphenyl) propionic acid ethyl ester enantiomers (2-HPPAEE)
in aqueous medium and transesterification of 4-methoxymandelic acid
enantiomers (4-MMA) in organic medium. The experimental results
indicated that PFL@Uio-66(Zr) exhibits excellent enzymatic catalysis
performances and high enantioselectives. In addition, to increase
catalytic activity and reusability, PFL is modified by the polyethylene
glycol (PEG) to prepare PEG-modified lipase (PFL-PEG), then PFL-PEG is
immobilized onto Uio-66(Zr) to prepare PFL-PEG@Uio-66(Zr), demonstrating
better reusability and catalytic activity compared with PFL@Uio-66(Zr).