Stability of lipid excipients in solid lipid nanoparticles

Area of Science:

• Pharmaceutical Technology
• Materials Science
• Physical Chemistry

Background:

• Lipids are crucial excipients in Solid Lipid Nanoparticles (SLN) formulation.
• Understanding lipid chemical stability within SLN is vital for drug delivery applications.
• Excipient stability directly impacts the shelf-life and efficacy of nanoparticle-based therapeutics.

Purpose of the Study:

• To evaluate the chemical stability of various lipids used as excipients in SLN.
• To determine the influence of lipid type and surfactant composition on SLN stability.
• To assess the impact of the SLN production process on lipid excipient integrity.

Main Methods:

• Formulation of SLN using different lipids and surfactant systems via hot homogenization.
• Characterization of SLN using photon correlation spectroscopy, laser diffractometry, zeta potential, and differential scanning calorimetry.
• Chemical stability assessment of lipid excipients using gas chromatography (GC) after lipid extraction.

Main Results:

• The SLN production process did not compromise the chemical stability of the lipid matrix.
• SLN formulations based on triglycerides demonstrated minimal lipid decomposition at 25°C.
• Dynasan 118 exhibited superior chemical stability, with less than 4% degradation over two years.

Conclusions:

• Triglyceride-based lipids are highly stable excipients for SLN production.
• Dynasan 118 is a promising lipid excipient for long-term stable SLN formulations.
• SLN manufacturing via hot homogenization preserves the chemical integrity of lipid excipients.