Quality by design: optimization of a liquid filled pH-responsive macroparticles using Draper-Lin composite design

Area of Science:

• Materials Science
• Pharmaceutical Technology
• Chemical Engineering

Background:

• Peppermint oil (PO) possesses various therapeutic properties but requires effective delivery systems.
• pH-responsive delivery systems can enhance targeted release and improve efficacy.
• Macroparticle formulations offer advantages in controlled release applications.

Purpose of the Study:

• To prepare and characterize pH-responsive macroparticles incorporating peppermint oil (PO).
• To optimize the macroparticle formulation and encapsulation process using a Quality by Design (QbD) approach.
• To investigate the impact of key formulation variables on encapsulation efficiency and PO loading.

Main Methods:

• Emulsification/polymer precipitation technique for macroparticle preparation.
• Quality by Design (QbD) methodology utilizing a Draper-Lin small composite design.
• Analysis of variance (ANOVA) and multiple regression analysis to identify critical parameters.
• Desirability function for global optimization of the encapsulation process.

Main Results:

• Polymer concentration was identified as the most significant factor influencing encapsulation efficiency (p < 0.05).
• Mathematical models were developed to describe the relationship between independent variables and responses.
• Optimized macroparticles were predicted to achieve 93.4% encapsulation efficiency and 72.8% PO loading.
• Experimental validation closely matched predicted values (89.2% encapsulation efficiency, 69.5% PO loading).

Conclusions:

• pH-responsive macroparticles incorporating peppermint oil were successfully prepared.
• The QbD approach effectively optimized the encapsulation process, enhancing efficiency and loading.
• The developed macroparticles demonstrate potential for controlled and targeted delivery of peppermint oil.