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

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

Offizielle URL: http://dx.doi.org/10.1002/ceat.200900384

Kurzbeschreibung (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.

Typ des Eintrags: Artikel
Erschienen: 2009
Autor(en): Bauer, Peter ; Horlacher, Peter ; Claus, Peter
Titel: Direct Isomerization of Linoleic Acid to Conjugated Linoleic Acids (CLA) using Gold Catalysts
Sprache: Englisch
Kurzbeschreibung (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.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Chemical Engineering & Technology
Band: 32
(Heft-)Nummer: 12
Freie Schlagworte: Conjugated linoleic acid (CLA) • Fatty acids • Functional food • Gold catalysts • Hydrogenation • Isomerization
Fachbereich(e)/-gebiet(e): Fachbereich Chemie
Fachbereich Chemie > Technische Chemie > Technische Chemie II
Fachbereich Chemie > Technische Chemie
Hinterlegungsdatum: 17 Sep 2009 09:21
Offizielle URL: http://dx.doi.org/10.1002/ceat.200900384
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Published Online: 16. Oktober 2009

ID-Nummer: 10.1002/ceat.200900384
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