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Influence Of Spin Probe Structure On Its Distribution In SLN Dispersions.

P. Ahlin, J. Kristl, M. Sentjurc, J. Strancar, S. Pečar
Published 2000 · Chemistry, Medicine

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Solid lipid nanoparticles (SLN) are drug carrier system composed of biodegradable substances, which are solid at room temperature. The physico-chemical properties and structure of the incorporated compounds can affect their partitioning in SLN dispersions. In this work the influence of lipophilicity and structure of different SP on its location in SLN were studied. By electron paramagnetic resonance (EPR) measurements it was found that lipophilic SP distribute between a solid glyceride core and a soft phospholipid layer, with the more polar part (piperidine ring or methylcarboxylic groups) oriented toward the water-lipid interface. The majority of SP is located in the phospholipid layer, but the portion in the solid lipid core increases with SP lipophilicity. The hydrophilic Tempol does not incorporate into SLN.
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