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Atomic force microscopy studies of solid lipid nanoparticles

A zur Mühlen1, E zur Mühlen, H Niehus

  • 1Department of Pharmaceutics, Biopharmaceutics and Biotechnology, Freie Universität Berlin, Germany.

Pharmaceutical Research
|September 1, 1996
PubMed
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Solid Lipid Nanoparticles (SLN) exhibit biphasic drug release. A soft outer layer causes initial fast release, while the crystalline core ensures sustained prednisolone delivery over weeks.

Area of Science:

  • Pharmaceutical Nanotechnology
  • Drug Delivery Systems

Background:

  • Solid Lipid Nanoparticles (SLN) offer controlled drug delivery.
  • Prednisolone-loaded SLN typically display biphasic release patterns.

Purpose of the Study:

  • To investigate the physical characteristics of prednisolone-loaded SLN.
  • To correlate particle properties with observed drug release behavior.

Main Methods:

  • High-pressure homogenization for SLN preparation.
  • Atomic Force Microscopy (AFM) for particle imaging and surface analysis.
  • Differential Scanning Calorimetry (DSC) for crystallinity assessment.

Main Results:

  • AFM revealed a disc-like shape for the SLN.

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  • DSC confirmed a crystalline core within the nanoparticles.
  • A distinct soft outer layer was identified surrounding the crystalline core.

    • Conclusions:

    • The soft outer layer likely accounts for the rapid initial drug release.
    • Sustained drug release is attributed to the crystalline core of the SLN.
    • Understanding SLN structure is key to controlling drug release kinetics.