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Your search keyword '"Daniel Zufferey"' showing total 2 results
Start Over Author "Daniel Zufferey" Topic ionic liquids
2 results on '"Daniel Zufferey"'

1. Enzyme catalysis with small ionic liquid quantities

Author

Julien Mutschler, Fabian Fischer, and Daniel Zufferey

Subjects
Esterification, Chemistry, Ionic Liquids, Stereoisomerism, Bioengineering, Lipase, Applied Microbiology and Biotechnology, Enzyme catalysis, Catalysis, Enzyme Activation, Solvent, Reaction rate, chemistry.chemical_compound, Chemical engineering, Biocatalysis, Glycerolysis, Ionic liquid, Solvents, Organic chemistry, Stereoselectivity, Biotechnology
Abstract

Enzyme catalysis with minimal ionic liquid quantities improves reaction rates, stereoselectivity and enables solvent-free processing. In particular the widely used lipases combine well with many ionic liquids. Demonstrated applications are racemate separation, esterification and glycerolysis. Minimal solvent processing is also an alternative to sluggish solvent-free catalysis. The method allows simplified down-stream processing, as only traces of ionic liquids have to be removed.

Published
2010

2. Ionic liquid-coated immobilized lipase for the synthesis of methylglucose fatty acid esters.

Author

Julien Mutschler, Thierry Rausis, Jean-Marc Bourgeois, Christèle Bastian, Daniel Zufferey, Isabelle Vanessa Mohrenz, and Fabian Fischer

Subjects
ORGANIC synthesis, IONIC liquids, ESTERS, FATTY acids, BIOSURFACTANTS, GLUCOSE, METHYLATION, LIPASES
Abstract

A homologous series of biosurfactants has been synthesized by a novel sustainable biotransformation technique and compared with three other enzymatic processes. 6-O-Alkanoyl-methyl-α-D-glucopyranosides were obtained by lipase mediated esterification of methyl-α-D-glucopyranoside with capric acid C10:0, lauric acid C12:0, myristic acid C14:0, palmitic acid C16:0, and oleic acid C18:1. Solvent free transformations were compared with the use of ionic liquids and organic solvents. The lipase from Candida antarcticaB, immobilized on macroporous acrylic acid beads (Novozyme 435), was employed either untreated or coated with small amounts of ionic liquids. This resulted in superior efficiencies (80%) with 1-butyl-4-methylpyridine hexafluorophosphate [4bmpy][PF6] and broader substrate tolerance in comparison to solvent free transformation. The results show a positive correlation with increasing polarity of the ionic liquids used as liquid film-coating, which was in opposition to the use of the same ionic liquid as solvent. The analysis of the ionic liquid film coated catalyst carriers was performed by optical and scanning electron microscopy (SEM). [ABSTRACT FROM AUTHOR]

Published
2009
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