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Direct Isomerization of Linoleic Acid to Conjugated Linoleic Acids (CLA) using Gold Catalysts

Bauer, Peter and Horlacher, Peter and Claus, Peter (2009):
Direct Isomerization of Linoleic Acid to Conjugated Linoleic Acids (CLA) using Gold Catalysts.
In: Chemical Engineering & Technology, pp. 2005-2010, 32, (12), [Online-Edition: http://dx.doi.org/10.1002/ceat.200900384],
[Article]

Abstract

Supported gold catalysts, e.g., Au on Al₂O₃, Fe₂O₃, CeO₂, MnO₂, TiO₂, ZrO₂, activated carbon, titanium silicalite TS-1, were prepared and used for the isomerization of linoleic acid (cis-9,cis-12-octadecadienoic acid) to conjugated linoleic acids (CLA) in the presence of hydrogen at 165 °C in a batch reactor. The best results were obtained using a catalyst with 2 wt % Au on TS-1, which exhibits a high selectivity (78 %) towards CLA. The two biologically active target CLA isomers, i.e., cis-9,trans-11-CLA and trans-10,cis-12-CLA, were the main products. During the isomerization of linoleic acid to CLA, consecutive reactions also took place. These were the hydrogenation of linoleic acid and CLA to monounsaturated octadecenoic acids and the further hydrogenation of monounsaturated acids to stearic acid. Thus, gold catalysts are capable of isomerizing linoleic acid to CLA and hydrogenating their double bonds to an extent that depends on the Au catalyst used.

Item Type: Article
Erschienen: 2009
Creators: Bauer, Peter and Horlacher, Peter and Claus, Peter
Title: Direct Isomerization of Linoleic Acid to Conjugated Linoleic Acids (CLA) using Gold Catalysts
Language: English
Abstract:

Supported gold catalysts, e.g., Au on Al₂O₃, Fe₂O₃, CeO₂, MnO₂, TiO₂, ZrO₂, activated carbon, titanium silicalite TS-1, were prepared and used for the isomerization of linoleic acid (cis-9,cis-12-octadecadienoic acid) to conjugated linoleic acids (CLA) in the presence of hydrogen at 165 °C in a batch reactor. The best results were obtained using a catalyst with 2 wt % Au on TS-1, which exhibits a high selectivity (78 %) towards CLA. The two biologically active target CLA isomers, i.e., cis-9,trans-11-CLA and trans-10,cis-12-CLA, were the main products. During the isomerization of linoleic acid to CLA, consecutive reactions also took place. These were the hydrogenation of linoleic acid and CLA to monounsaturated octadecenoic acids and the further hydrogenation of monounsaturated acids to stearic acid. Thus, gold catalysts are capable of isomerizing linoleic acid to CLA and hydrogenating their double bonds to an extent that depends on the Au catalyst used.

Journal or Publication Title: Chemical Engineering & Technology
Volume: 32
Number: 12
Uncontrolled Keywords: Conjugated linoleic acid (CLA) • Fatty acids • Functional food • Gold catalysts • Hydrogenation • Isomerization
Divisions: 07 Department of Chemistry
07 Department of Chemistry > Fachgebiet Technische Chemie > Technische Chemie II
07 Department of Chemistry > Fachgebiet Technische Chemie
Date Deposited: 17 Sep 2009 09:21
Official URL: http://dx.doi.org/10.1002/ceat.200900384
Additional Information:

Published Online: 16. Oktober 2009

Identification Number: doi:10.1002/ceat.200900384
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