FLUORESCENT SOLID LIPID NANOPARTICLES COMPOSITION AND PREPARATION THEREOF

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The present invention discloses a solid lipid nanoparticle (SLN) comprising : a) a solid lipid core comprising at least a glyceride and/or at least a fatty acid; b) a mixture of amphiphilic components forming a shell around said core a); c) an alkaline-earth complex with a compound of formula I and/or II : d) at least a fluorescent dye selected from : a cyanine fluorescent dye and /or a polyetherocyclic compound selected from : coumarin, pyrano, quinoline, pyranoquinoline, indole and pyranoindole derivates in acid form or a pharmaceutically acceptable salt thereof. These nanoparticles allow a prolonged blood circulation half-life, show enhanced photostability and improved fluorescence signal. The dye is preserved from degradation and improves the fluorescent quantum yield.