Dual drug delivery microcapsules via layer-by-layer self-assembly.

Area of Science:

• Materials Science
• Drug Delivery
• Polymer Chemistry

Background:

• Developing effective drug delivery systems for drugs with varying solubilities remains a challenge.
• Previous work demonstrated encapsulation of uncharged, water-insoluble drugs using the layer-by-layer (LbL) technique.
• Integrating both hydrophobic and hydrophilic drugs into a single system offers significant therapeutic potential.

Purpose of the Study:

• To develop and characterize polymer microcapsules capable of co-encapsulating two drugs with different solubility profiles.
• To investigate the application of the layer-by-layer (LbL) technique for dual-drug encapsulation.
• To analyze the drug release kinetics from the developed microcapsules.

Main Methods:

• Utilized the layer-by-layer (LbL) adsorption technique for sequential polyelectrolyte assembly.
• Co-encapsulated two distinct drugs with differing solubility characteristics within polymer microcapsules.
• Characterized the dual-drug microcapsules using confocal laser scanning microscopy, atomic force microscopy, visible microscopy, and transmission electron microscopy.
• Monitored thin film growth via UV-vis spectroscopy and analyzed drug desorption kinetics using a second-order rate model.

Main Results:

• Successfully fabricated polymer microcapsules co-encapsulating two drugs of different solubility.
• Characterization confirmed the successful formation and structure of the dual-drug vehicular capsules.
• The desorption kinetics of both drugs from the thin film followed a second-order rate model, providing insights into release mechanisms.

Conclusions:

• The LbL technique is a viable method for creating polymer microcapsules that simultaneously deliver hydrophobic and hydrophilic drugs.
• This dual-drug delivery system offers a promising platform for combination therapies.
• Understanding desorption kinetics is crucial for optimizing drug release profiles in such systems.