84654-70-6Relevant academic research and scientific papers
Lipase activity enhancement by SC-CO2 treatment
Hlavsova, Klara,Wimmer, Zdenek,Xanthakis, Epameinondas,Bernasek, Prokop,Sovova, Helena,Zarevucka, Marie
experimental part, p. 779 - 784 (2009/02/06)
The activity of lipases from porcine pancreas, Candida antartica recombinant from Aspergillus oryzae, Candida cylindracea (immobilized), Penicilium roqueforti, Aspergillus niger, Rhizopus arrhizus, Mucor miehei (two types of immobilization), and Pseudomonas cepacia (two types of immobilization) was studied after using them as biocatalysts of blackcurrant oil hydrolysis under SC-CO2 conditions. The reaction was performed at 40°C and 15 MPa in a continuous-flow reactor. Increased relative activity of all used lipases after the hydrolytic reaction was observed. The most remarkable increase in the activity was noted for the lipase from Rhizopus arrhizus which was increased by more than 50 times. The highest activity was shown by Lipozyme, lipase from Mucor miehei, immobilized on macroporous resin. Both treated and untreated Lipozyme were used as biocatalysts in hydrolytic resolution of the racemic cis- or frani-isomers of 2-(4-methoxybenzyl) cyclIohexyl acetates. Satisfactory reaction yields (40 %) and excellent enantiomeric purity of the products (E = 472) were obtained when hydrolysis of the frans-isomer of 2-(4-methoxybenzyl)cyclohexyl acetate was catalyzed by Lipozyme treated with SC-CO2.
Application of ionic liquids in enzymic resolution by hydrolysis of cycloalkyl acetates
Xanthakis, Epameinondas,Zarevucka, Marie,Saman, David,Wimmerova, Martina,Kolisis, Fragiskos N.,Wimmer, Zdenek
, p. 2987 - 2992 (2007/10/03)
A comparative study was performed in the enzymic resolution of the isomers of 2-(4-methoxybenzyl)cyclohexyl acetates 1 and 2. The investigation consisted in application of three commercially available lipases (Novozyme 435, Lipozyme IM and non-immobilized
Enzymic resolution of 2-substituted cyclohexanols through lipase-mediated esterification
Wimmer, Zdenek,Skouridou, Vasso,Zarevucka, Marie,Saman, David,Kolisis, Fragiskos N.
, p. 3911 - 3917 (2007/10/03)
Several lipases were used for the kinetic resolution of the racemic cis- and trans-isomers of 2-(4-methoxybenzyl)cyclohexanol, by lipase-mediated esterification of the substrates to the corresponding acetate isomers. Lipase from Rhizomucor miehei was foun
BIOTRANFORMATION OF 2-(4-METHOXYBENZYL)-1-CYCLOHEXANONE BY MEANS OF Saccharomyces cerevisiae
Wimmer, Zdenek,Budesinsky, Milos,Macek, Tomas,Svatos, Ales,Saman, David,et.al.
, p. 2326 - 2337 (2007/10/02)
Biotranformation reduction of 2-(4-methoxybenzyl)-1-cyclohexanone was investigated.A method was elaborated for the preparation of some diastereoisomeric alcohols derived from the racemic title ketone and for the determination of the products obtained.The
CONFORMATION STUDIES OF ISOMERIC 1-ACYLOXY-2-(4-METHOXYBENZYL)-CYCLOHEXANES BY 1H NMR SPECTTOSCOPY
Budesinsky, Milos,Saman, David,Wimmer, Zdenek
, p. 2763 - 2767 (2007/10/02)
The conformation of the cyclohexane ring and the p-methoxybenzyl substituent in the series of isomeric 1-acyloxy-2-(4-methoxybenzyl)cyclohexanes was studied by means of 1H NMR spectroscopy.In all the substances investigated the cyclohexane ring assumes ch
