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Spray-drying of solid lipid nanoparticles (SLN TM)

C Freitas1, R H Müllerä

  • 1Freie Universität Berlin, Berlin, Germany.

European Journal of Pharmaceutics and Biopharmaceutics : Official Journal of Arbeitsgemeinschaft Fur Pharmazeutische Verfahrenstechnik E.V
|October 31, 1998
PubMed
Summary

Spray-drying solid lipid nanoparticles (SLN) creates stable, reconstitutable powders for intravenous administration. Optimized parameters maintained particle size distribution post-redispersion.

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Area of Science:

  • Pharmaceutical Technology
  • Nanotechnology
  • Materials Science

Background:

  • Solid lipid nanoparticles (SLN) offer potential for drug delivery but require stable formulations for long-term storage and administration.
  • Developing dry, reconstitutable SLN powders is crucial for overcoming challenges associated with liquid dispersions, such as limited shelf-life and administration difficulties.

Purpose of the Study:

  • To investigate the conversion of aqueous solid lipid nanoparticle (SLN) dispersions into stable, dry powders via spray-drying.
  • To evaluate the suitability of the redipersed SLN for intravenous (i.v.) administration, focusing on particle size distribution and toxicity.
  • To identify key parameters influencing particle size during spray-drying and redispersion.

Main Methods:

  • Aqueous SLN dispersions were spray-dried using physiologically acceptable excipients like carbohydrates and alcohols.

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  • Particle size distribution and toxicity were assessed after redispersion of the dry SLN powders.
  • Systematic variation of spraying parameters, lipid concentration, sugar concentration, and redispersion media (including poloxamer 188) was performed.

    • Main Results:

    • Spray-drying successfully produced dry, reconstitutable SLN powders with acceptable long-term storage stability.
    • Redispersion yielded granulates with particle size distributions and toxicity profiles suitable for i.v. administration.
    • Identical particle size distributions before and after spray-drying/redispersion were achieved by optimizing parameters such as spraying temperature, lipid/sugar concentrations, and redispersion medium.

    Conclusions:

    • Spray-drying is a viable method for producing stable, administrable SLN powders from aqueous dispersions.
    • Careful selection of excipients and optimization of spray-drying and redispersion parameters are critical for maintaining SLN integrity and suitability for i.v. use.
    • The developed method offers a promising approach for the formulation and delivery of lipid-based nanoparticles.