Enhanced Analytic Approach for Describing pH Triggered Fast Drug Release Systems

Area of Science:

• Nanotechnology
• Materials Science
• Pharmaceutical Sciences

Background:

• pH-sensitive dendrimers on nanocarriers offer facile drug release but are poorly modeled.
• Existing kinetic models lack pH dependence or treat it superficially, limiting their accuracy.
• Fast release from these systems is difficult to represent with current one-dimensional models.

Purpose of the Study:

• Develop an analytic equation for fast drug release from pH-sensitive nanocarriers.
• Integrate pH-dependent release into a two-dimensional model.
• Improve the representation of drug release kinetics in targeted delivery systems.

Main Methods:

• Compared four common kinetic models (Higuchi, Korsmeyer-Peppas showed best fit).
• Observed slope angle behavior of release curves for pH-triggered release.
• Proposed a novel analytic equation based on the time-dependent slope angle.
• Incorporated a modified step function for pH-dependent "on/off" release behavior.

Main Results:

• The new model accurately fits one-dimensional time-dependent release data.
• The model also successfully represents two-dimensional pH-dependent release.
• Demonstrated improved fitting compared to existing models lacking pH sensitivity.

Conclusions:

• The developed two-dimensional analytic model effectively represents pH-sensitive fast drug release.
• This model provides a more accurate tool for analyzing drug release profiles from advanced nanocarrier systems.
• Offers a significant advancement for designing and optimizing targeted drug delivery strategies.