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Elaboration of double emulsion-based polymeric capsules for fragrance

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Abstract

We aim at encapsulating fragrances made of a variety of lipophilic species to slow down their diffusion. Our strategy is to develop capsules by polymerizing the water intermediate phase of an oil-in-water-in-oil double emulsion. In other terms, our system consists in a direct emulsion of fragrance (O1) in a water phase (W) containing monomer, initiator, and cross-linker. To obtain the double emulsion, this direct emulsion, stabilized by a hydrophilic surfactant, is itself dispersed in an external lipophilic solvent used in perfumery (O2) and stabilized by a lipophilic surfactant. Polymerization of the intermediate water phase aims at obtaining a 3D network. Differently from nowadays-proposed capsules, this strategy allows polymerization only taking place in the water phase rather in the phase containing the fragrance. Moreover, the obtained 3D network is supposed to play the role of an effective barrier limiting the diffusion of the inner lipophilic species towards either the external solvent or air. Such an approach implies the combination of a formulation step to elaborate the double emulsion using two antagonistic surfactants, a hydrophilic one and a lipophilic one, and of the polymerization of the intermediate phase. Insertion of the polymerizable species in the double emulsion shall not destabilize it. Some monomers exhibiting interfacial affinity and interfering with the formulation of the double emulsion have to be avoided. By varying the nature of the monomers and the cross-linker to monomer ratio, capsules with high encapsulation efficiencies and with various mechanical properties have been obtained.

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Acknowledgments

The authors would like to thank Olivier Anthony for fruitful discussions, Eric Laurichesse for his technical support, Maud Bassereau for her support in interpreting some GC chromatograms, and Takasago Europe Perfumery Laboratory for assembling the fragrances.

Funding

This study received financial support from the ANRT, Takasago Europe Perfumery Laboratory, CNRS, Université de Bordeaux, and INP (contract number 2014/1309).

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Authors and Affiliations

  1. Centre de Recherche Paul Pascal UMR 5031 CNRS, University of Bordeaux, Bordeaux, France

    Margot Stasse & Véronique Schmitt

  2. Laboratoire de Chimie des Polymères Organiques UMR 5629 CNRS, University of Bordeaux, Bordeaux, France

    Margot Stasse & Valérie Héroguez

  3. Takasago Europe Perfumery Laboratory, 12 rue Torricelli, 75017, Paris, France

    Tiphaine Ribaut

Authors
  1. Margot Stasse
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  2. Tiphaine Ribaut
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  3. Valérie Héroguez
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  4. Véronique Schmitt
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Correspondence to Valérie Héroguez or Véronique Schmitt.

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Stasse, M., Ribaut, T., Héroguez, V. et al. Elaboration of double emulsion-based polymeric capsules for fragrance. Colloid Polym Sci 299, 179–191 (2021). https://doi.org/10.1007/s00396-020-04702-8

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  • DOI: https://doi.org/10.1007/s00396-020-04702-8

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