Poster (Scientific congresses and symposiums)
Combination of lipase catalysis and thiol-Michael addition for the synthesis of carbohydrate esters used as stabilizers in supercritical carbon dioxide emulsions
Boyère, Cédric; Favrelle, Audrey; Broze, Guy et al.
2011PAI P6/27 Annual Meeting
 

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Keywords :
enzymatic reaction
Abstract :
[en] The use of aqueous dispersed media, such as emulsions and miniemulsions, has many advantages over solution processes for chemical transformations and polymerization reactions, i.e. limited environmental impact, ease of products recovery and increased reaction rate. Although, dispersed media are usually implemented from water/solvent mixtures, supercritical carbon dioxide (scCO2) (Pc =74 bars; Tc = 31°C) constitutes an interesting alternative to the traditional organic solvents because it is inexpensive, non-toxic, non-flammable and environmentally friendlier. In this context, we develop a novel class of surface active compounds able to stabilize water/scCO2 emulsions, i.e. fluorinated modified carbohydrates. The hydrophilic head of the surfactant consists in a sugar moiety whereas the fluorinated tail has a strong affinity for the scCO2 phase. These carbohydrate esters are prepared by a two-step strategy which takes advantage of the selectivity of enzymatic catalysis and the versatility of the thiol-Michael addition reaction. The new thiolated mannose intermediate is a useful building block for the incorporation of unprotected sugar moieties into complex molecules. The surface active properties of the fluorinated derivatives have been evaluated as well as their use as stabilizers for the preparation of microparticles and highly porous polymer materials in scCO2.
Research center :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Chemistry
Materials science & engineering
Author, co-author :
Boyère, Cédric ;  Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Favrelle, Audrey;  Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Broze, Guy ;  Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Paquot, Michel ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Unit of Biological and Industrial Chemistry
Blecker, Christophe ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Laboratory of Food Technology
Jérôme, Christine  ;  Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Debuigne, Antoine  ;  Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Language :
English
Title :
Combination of lipase catalysis and thiol-Michael addition for the synthesis of carbohydrate esters used as stabilizers in supercritical carbon dioxide emulsions
Publication date :
21 November 2011
Event name :
PAI P6/27 Annual Meeting
Event place :
Leuven, Belgium
Event date :
21/11/2011 - 22/11/2011
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
The ARC program SUPERZYM
Commentary :
This poster was presented by Cédric Boyère
Available on ORBi :
since 27 January 2012

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