Biotechnologie et biomatériaux

Abstrait

Elaboration of double emulsion based polymeric capsules for fragrance

Schmitt V

We aim at encapsulating fragrances manufactured from a range of lipotropic species to bog down their diffusion. Our strategy is to develop capsules by polymerizing the water intermediate section of associate oil-in-water-in-oil double emulsion. In different terms, our system consists in an exceedingly direct emulsion of fragrance (O1) in an exceedingly water section (W) containing chemical compound, leader and crosslinker. to get the double emulsion, this direct emulsion, stabilised by a deliquescent surface-active agent, is itself spread in associate external lipotropic solvent utilized in perfumery (O2) and stabilised by a lipotropic surface-active agent. polymerisation of the intermediate water section aim at getting a 3D network. This strategy exhibits the subsequent benefits over different today planned capsules: polymerisation solely takes place within the water section attributable to the solubility of the chemical compound and also the obtained 3D network is meant to play the role of a good barrier limiting the diffusion of the inner lipotropic species towards either the external solvent or air. Such a technique implies combining formulation for the elaboration of the double emulsion mistreatment 2 antagonistic surfactants, a deliquescent and a lipotropic one and polymerisation of the intermediate section. Insertion of the polymerizable species within the double emulsion shall not destabilize it. Some monomers exhibiting surface affinity and intrusive with the formulation of the double emulsion need to be avoided. By variable the character of the monomers, the leader to chemical compound quantitative relation and also the crossliknker to chemical compound quantitative relation, capsules with high encapsulation efficiencies and with numerous mechanical properties are obtained.