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Title:Silica aerogels as support for lipase catalyzed esterifications at sub- and supercritical conditions
Authors:ID Novak, Zoran (Author)
ID Leitgeb, Maja (Author)
ID Krmelj, Vlasta (Author)
ID Knez, Željko (Author)
Files:URL http://dx.doi.org/10.1016/S0896-8446(02)00233-4
 
Language:English
Work type:Unknown
Typology:1.01 - Original Scientific Article
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:The enzymes (lipases from Candida rugosa and porcine pancreas) were immobilized on silica aerogels by sol-gel procedure followed by supercritical drying with CO2. Such immobilized enzymes were used as biocatalysts for esterification in supercritical CO2 and near critical propane at 40 °C and 100 bar. It was found out that the initial reaction rates in propane rose two to three times in comparison with the same reaction, catalyzed by free lipase. SC CO2 deactivated the non-immobilized lipase in reaction mixture while with the immobilized enzyme the conversion was 35%. The initial reaction rates in propane were 20 times higher than in water medium due to the properties of propane as a medium for esterification of fatty acids.
Keywords:chemical processing, biotechnology, esterification, immobilization of enzymes, supercritial CO2, propane, lipases, supercritical CO2 drying
Year of publishing:2003
PID:20.500.12556/DKUM-27685 New window
UDC:66.095.1
ISSN on article:0896-8446
COBISS.SI-ID:8156950 New window
NUK URN:URN:SI:UM:DK:3MZ1ABZP
Publication date in DKUM:01.06.2012
Views:1880
Downloads:29
Metadata:XML DC-XML DC-RDF
Categories:Misc.
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Record is a part of a journal

Title:The Journal of supercritical fluids
Shortened title:J. supercrit. fluids
Publisher:PRA Press
ISSN:0896-8446
COBISS.SI-ID:25795072 New window

Secondary language

Language:English
Keywords:kemijska procesna tehnika, biotehnologija, esterifikacija, imobilizacija encimov, superkritični CO2, lipaze, superkritično CO2 sušenje


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