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J-complexes of retinol formed within the nanoparticles prepared from microemulsions

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An Erratum to this article was published on 12 August 2008

Abstract

Retinol nanoparticles have been obtained by direct precipitation of retinol in the inner water cores of AOT/heptane/water microemulsions. The retinol dissolved in chloroform was injected into the microemulsion. The diameter of the so-obtained nanoparticles was measured using transmission electron microscope pictures where the revelation was made thanks to adsorbed iodine on the nanoparticles. The size is ca 6.0 nm, and it is not dependent either on the size of the water droplets or the concentration of the retinol molecules. This phenomenon is explained by the thermodynamic stabilization of the nanoparticles at a certain size. UV-visible spectra of the nanoparticles show a new band the maximum of which has a bathochromic shift with respect to the absorption band of the retinol monomers. If the bathochromic shift is plotted as a function of the line width, a linear correlation is obtained, the line width is decreasing with increasing shift. This behavior is interpreted as being due to an excitonic transition of a J-complex. Quantum chemical calculations have been carried out to confirm the presence of J-complexes. Taking into account the various possible geometries, the results confirm the presence of J-complexes composed of three head-to-tail molecules on the average.

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Acknowledgment

C. Destrée gratefully acknowledges financial support from FRIA, Belgium. B. Champagne thanks the Belgian National Fund for Scientific Research for his Research Director position. The calculations have been performed on the Interuniversity Scientific Computing Facility (ISCF), installed at the Facultés Universitaires Notre-Dame de la Paix (Namur, Belgium), for which the authors gratefully acknowledge the financial support of the FNRS-FRFC and the “Loterie Nationale” for the convention no. 2.4578.02 and of the FUNDP. J. Ghijsen thanks the Belgian National Fund for Scientific Research for his Research Associate position.

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Authors and Affiliations

  1. Laboratoire de RMN, Facultés Universitaires Notre-Dame de la Paix, 61 rue de Bruxelles, 5000, Namur, Belgium

    C. Destrée, S. George & J. B.Nagy

  2. Laboratoire CTA, Facultés Universitaires Notre-Dame de la Paix, 61 rue de Bruxelles, 5000, Namur, Belgium

    B. Champagne & M. Guillaume

  3. Laboratoire LISE, Facultés Universitaires Notre-Dame de la Paix, 61 rue de Bruxelles, 5000, Namur, Belgium

    J. Ghijsen

Authors
  1. C. Destrée
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  2. S. George
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  3. B. Champagne
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  4. M. Guillaume
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  5. J. Ghijsen
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  6. J. B.Nagy
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Corresponding author

Correspondence to J. B.Nagy.

Additional information

An erratum to this article can be found at http://dx.doi.org/10.1007/s00396-008-1900-4

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Destrée, C., George, S., Champagne, B. et al. J-complexes of retinol formed within the nanoparticles prepared from microemulsions. Colloid Polym Sci 286, 15–30 (2008). https://doi.org/10.1007/s00396-007-1679-8

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  • DOI: https://doi.org/10.1007/s00396-007-1679-8

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