Nanovecteurs pour l'amélioration de la biodisponibilité orale

Abstract : The overall goal of this work consisted in ameliorating the bioavailability of drugs known for their poor hydrosolubility (testosterone) or for their lipidic character (omega-3 fatty acids). This was achieved using lipid nanoparticle systems and nanocrystals In case of testosterone the work consisted of the development of an oral dosage form with superior properties compared to the currently commercially available oral system (Andriol Testocaps®). The other part of this work was the design of a lipid nanoparticle-based omega- 3 fatty acid formulation, which, despite the use of cheap fish oil as source of omega-3 fatty acids, has low smell and taste properties while nevertheless being stable. The development of the oral testosterone drug delivery system was accomplished on the basis of lipid nanoparticles technology and also using drug nanocrystal technology. In both cases, systems could be developed that met the requirements with regards to drug loading (NLC) and stability (NLC and drug nanocrystals). Up to 30 % of testosterone undecanoate could be incorporated into the lipid phase of the NLC. Furthermore, the production of particles with different lipids, which are supposed to promote lymphatic absorption and hence the bioavailability of the hormone. Drug nanocrystals of testosterone (T) and testosterone undecanoate (TU) were prepared with a mean size of about 470 nm (TU) and 860 nm (T). Also with this system, an enhanced lymphatic absorption was expected. The bioavailabilites of the developed NLC based drug delivery systems were all higher than the bioavailability of the product on the market when no additional lipid was supplied. This gives reason to believe, that the influence of co-administered food on the bioavailability of the systems is less pronounced than with Andriol Testocaps®. Based on the findings that lipid nanoparticles can improve oral bioavailability, the development of an omega-3 fatty acids nanoparticulate system (NLC) out of cheap fish oil was a logic step. The oral bioavailability of the omega-3 fatty acids is much higher than the one of TU (about 70 %). Through the use of NLC technology, the taste and smell is even more reduced. It was rather unexpected that we achieved to have a formulation that consisted of 70 % lipid phase (and 30 % water) but still was paste-like and easy to redisperse. This makes the use of the paste as an additive in food and beverages possible to better supply the patient with essential omega-3 fatty acids.
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Marc Muchow. Nanovecteurs pour l'amélioration de la biodisponibilité orale. Médecine humaine et pathologie. Université Henri Poincaré - Nancy 1, 2009. Français. ⟨NNT : 2009NAN10073⟩. ⟨tel-01748304⟩

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