title: Improvement of catalytic activity of lipase in the presence of calix[4]arene valeric acid or hydrazine derivative.
abstract: Sol-gel encapsulation is a simple but powerful method to enhance the enantioselectivity of lipase-catalyzed transformations in an isooctane/aqueous buffer solution. Candida rugosa lipase was encapsulated according to a sol-gel procedure in the presence and absence of calix[4]arene hydrazine or carboxylic acid derivatives with Fe3O4 magnetic nanoparticles as an additive. The activity of the encapsulated lipases was evaluated for the enantioselective hydrolysis of racemic Naproxen methyl ester and the hydrolysis of p-Nitrophenylpalmitate. The results indicate that the encapsulated lipase without calix[4]arene derivative has lower conversion and enantioselectivity compared to the encapsulated lipase with calix[4]arene derivative. It was found that the calix[4]arene hydrazine and carboxylic acid-based encapsulated lipases have excellent activity and enantioselectivity (E >300) compared to encapsulated lipase without the calix[4]arene derivatives.
authors.affiliation: Department of Chemistry, Selcuk University, 42031, Konya, Turkey.
authors.forename: Enise
authors.initials: E
authors.lastname: Akoz
authors.forename: Serkan
authors.initials: S
authors.lastname: Sayin
authors.forename: Selcuk
authors.initials: S
authors.lastname: Kaplan
authors.forename: Mustafa
authors.initials: M
authors.lastname: Yilmaz
mesh_terms: D047250:Calixarenes / Q000737:chemistry*; D002175:Candida / Q000201:enzymology*; D002384:Catalysis; D004800:Enzymes, Immobilized / Q000737:chemistry; D005656:Fungal Proteins / Q000737:chemistry*; D008049:Lipase / Q000737:chemistry*; D060526:Magnetic Fields; D053758:Nanoparticles / Q000737:chemistry*
chemical_list: D004800:Enzymes, Immobilized; D005656:Fungal Proteins; D047250:Calixarenes; D008049:Lipase