Abstract
Intensive research is required for the development of carrier systems that promote skin penetration of active compounds. These drugs have to be delivered selectively and in sufficient amounts to the site of interest. Therefore, the physicochemical properties of the drug-loaded carrier systems must be fully understood. Electron paramagnetic resonance (EPR) spectroscopy is a powerful tool to investigate the distribution of labeled drugs or drug analogs within a carrier to follow the penetration process and to determine the penetration efficiency. In this chapter we outline the fundamentals of EPR spectroscopy with particular focus on its applications in dermatopharmacology. We describe investigations with invasomes (ultraflexible liposomes), polymeric-based core-multishell nanotransporters, and nanostructured lipid carriers. These delivery systems were prepared or loaded with EPR-spin probes, and spin probe location within or on the carrier was investigated as well as their penetration properties.
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Acknowledgment
This work was funded by the Freie Universität (FU) Berlin, Focus Area Functional Nanoscale Materials. Furthermore, we thank Ming Chen and Alfred Fahr (Department of Pharmacy, Friedrich-Schiller-Universität Jena) for providing the invasomes, Emanuel Fleige and Rainer Haag (Department of Chemistry, FU-Berlin) for providing the CMS-nanotransporters, and Daniel Peters and Cornelia Keck (Department of Pharmacy, FU-Berlin) for providing the nanostructured lipid carriers. We also thank Robert Bittl and Christian Teutloff (Department of Physics, FU-Berlin) for Q- and W-band measurements as well as their valuable support regarding spectra analysis, and Monika Schäfer-Korting (Department of Pharmacy, FU-Berlin) for fruitful discussions.
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Haag, S.F., Lademann, J., Meinke, M.C. (2017). Application of EPR-spin Probes to Evaluate Penetration Efficiency, Storage Capacity of Nanotransporters, and Drug Release. In: Dragicevic, N., I. Maibach, H. (eds) Percutaneous Penetration Enhancers Drug Penetration Into/Through the Skin. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-53270-6_12
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DOI: https://doi.org/10.1007/978-3-662-53270-6_12
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