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Summary

Drug and vaccine release from nanocarriers can be influenced by energetic heterogeneity. This study presents a kinetic model showing release kinetics can be linear then logarithmic, fitting empirical models.

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Area of Science:

  • Drug delivery systems
  • Nanotechnology
  • Physical chemistry

Background:

  • Drug and vaccine release from carriers is typically diffusion or dissolution limited.
  • Empirical models like Weibull and Korsmeyer-Peppas are used to fit experimental release kinetics.
  • Nanocarrier size reduction to ~100 nm can lead to kinetically limited release due to interface-controlled molecular jumps.

Purpose of the Study:

  • To present a general kinetic model for drug/vaccine release from structurally heterogeneous nanocarriers.
  • To investigate the role of energetic heterogeneity in nanocarrier release kinetics.
  • To explain the observed release profiles and their fitting with empirical models.

Main Methods:

  • Development of a general kinetic model incorporating energetic heterogeneity.
  • Simulation of release kinetics with varying binding energy deviations (4-8 kcal mol⁻¹).
  • Analysis of predicted kinetics and their fit to Weibull and Korsmeyer-Peppas expressions.

Main Results:

  • Predicted kinetics initially show linear behavior, transitioning to logarithmic with time.
  • The model accurately fits predicted kinetics using Weibull or Korsmeyer-Peppas expressions with exponents between 0.6 and 0.75.
  • Energetic heterogeneity is demonstrated as a significant factor controlling release kinetics, potentially explaining non-Fickian diffusion observations.

Conclusions:

  • Energetic heterogeneity in nanocarriers significantly impacts drug and vaccine release profiles.
  • The proposed kinetic model provides a physically grounded explanation for observed release kinetics, including those fitted by empirical models.
  • This understanding can aid in the design of advanced nanocarrier systems with controlled release properties.