Related Experiment Videos
Diffusion and mathematical modeling of release profiles from nanocarriers
Letícia Cruz1, Leonardo U Soares, Teresa Dalla Costa
1Programa de Pós-Graduação em Ciências Farmacêuticas, Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
International Journal of Pharmaceutics
|March 1, 2006
Summary
Drug delivery systems like nanocapsules, nanoemulsions, and nanospheres show distinct release kinetics based on formulation. Polymer presence impacts burst release, while oil affects sustained drug release, optimizing nanocarrier performance.
Area of Science:
- Nanotechnology
- Materials Science
- Pharmaceutical Sciences
Background:
- Nanocarriers are crucial for drug delivery, but their release kinetics vary significantly.
- Understanding the internal structure and composition of nanocarriers is key to controlling drug release.
Purpose of the Study:
- To establish models and differentiate the kinetic release behavior of drug models from nanocapsules, nanoemulsion, and nanospheres.
- To investigate the influence of formulation components on drug release profiles.
Main Methods:
- Physico-chemical characterization including Small-Angle X-ray Scattering (SAXS).
- Drug release experiments and mathematical modeling of release profiles.
- Analysis of particle size, probe content, pH, and zeta potential.
Main Results:
- SAXS revealed different internal organization in nanocapsules (polymer) versus nanospheres (sorbitan monostearate impurity).
- Adsorbed drug release was similar across nanocarriers, but entrapped drug release differed.
- Mathematical modeling indicated polymer presence increases burst phase half-lives, while oil presence increases sustained phase half-lives.
Conclusions:
- Nanocarrier composition and internal structure significantly influence drug release kinetics.
- Nanocapsules, nanospheres, and nanoemulsions exhibit distinct release profiles for entrapped drugs.
- Formulation optimization is critical for tailoring drug release from nanocarrier systems.