Influence of OR ester group length on the catalytic activity and enantioselectivity of free lipase and immobilized in membrane used for the kinetic resolution of naproxen esters
作者:L GIORNO、E DAMORE、E DRIOLI、R CASSANO、N PICCI
DOI:10.1016/j.jcat.2007.01.021
日期:2007.4.25
Lipases are suitable catalysts for the kinetic resolution of racemic mixtures due to their ability to discriminate between enantiomers. For this reason, they have been studied largely to develop reactors for the production of optically pure enantiomers. The main problem in these productive systems is enzyme stability and enantiocatalytic selectivity as a function of time. In this work, the enantiocatalytic properties of lipase as a function of the -OR group length were studied. The methyl, butyl, and octyl esters of naproxen were synthesized and used as reagents. The lipase was used as a free agent and immobilized in a polymeric membrane reactor. The results show that selectivity and stability of the enzyme improved while catalytic activity decreased with the -OR length group. The immobilized enzyme had higher activity compared with the free enzyme. (C) 2007 Elsevier Inc. All rights reserved.
Ester des Naproxens als potentielle Prodrugs zur Hautpenetration, 1. Mitt.: Synthese und physikochemische Eigenschaften
作者:Horst Weber、Klaudia Meyer-Trümpener
DOI:10.1002/ardp.19943270511
日期:——
Standardmethoden synthetisiert. Durch dynamische Differenzkalorimetrie DSC wurden der Schmelzpunkt und die Schmelzenthalpie der einzelnen Verbindungen erhalten. Mittels HPLC wurde die Sättigungskonzentration in Wasser bestimmt. Der Verteilungskoeffizient Octanol/Wasser wurde nach Rekker und Mannhold berechnet und der Rm‐Wert durch RP‐DC bestimmt. Die beiden letzten Parameter lassen sich mit hoher Signifikanz