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Related Experiment Videos

Solid lipid nanoparticles (SLN) as ocular delivery system for tobramycin.

Roberta Cavalli1, M Rosa Gasco, Patrizia Chetoni

  • 1Dipartimento di Scienza e Tecnologia del Farmaco, Università di Torino, I-10125, Torino, Italy. roberta.cavalli@unito.it

International Journal of Pharmaceutics
|May 9, 2002
PubMed
Summary

Solid lipid nanoparticles (SLN) effectively deliver tobramycin (TOB) to the eye. These SLN carriers enhance drug retention and significantly increase tobramycin bioavailability in the aqueous humor compared to standard eyedrops.

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Area of Science:

  • Ophthalmology
  • Nanotechnology
  • Pharmaceutics

Background:

  • Topical ocular drug delivery faces challenges like rapid clearance and low bioavailability.
  • Solid lipid nanoparticles (SLN) offer potential as advanced drug delivery systems.
  • Tobramycin (TOB) is a crucial antibiotic for treating ocular infections.

Purpose of the Study:

  • To investigate the efficacy of solid lipid nanoparticles (SLN) for topical ocular delivery of tobramycin (TOB).
  • To assess the preocular retention and ocular bioavailability of tobramycin delivered via SLN.

Main Methods:

  • Characterization of SLN for size and polydispersity index.
  • Evaluation of preocular retention of fluorescent SLN (F-SLN) in rabbit eyes.
  • Quantification of tobramycin concentration in aqueous humor after topical administration of TOB-loaded SLN (TOB-SLN) in rabbits.

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Main Results:

  • SLN exhibited colloidal size range (average diameter < 100 nm, PDI < 0.2).
  • Fluorescent SLN showed prolonged retention in the corneal surface and conjunctival sac compared to aqueous solutions.
  • TOB-SLN administration resulted in significantly higher tobramycin bioavailability in the aqueous humor than conventional tobramycin eyedrops.

Conclusions:

  • Solid lipid nanoparticles are effective carriers for topical ocular tobramycin delivery.
  • SLN enhance ocular drug retention and improve tobramycin bioavailability.
  • This SLN formulation represents a promising approach for enhanced ocular tobramycin therapy.