Cubic phase gels as drug delivery systems

Area of Science:

• Materials Science
• Biotechnology
• Pharmaceutical Sciences

Background:

• Lipids are widely utilized in drug delivery systems like liposomes and solid matrices.
• Liquid crystalline cubic phases are spontaneously formed by amphiphilic lipids in aqueous environments.
• These phases exhibit a unique, thermodynamically stable structure with bicontinuous lipid bilayers and water channels.

Purpose of the Study:

• To evaluate the potential of liquid crystalline cubic phases as a drug delivery system.
• To explore the structural characteristics and drug incorporation capabilities of cubic phases.
• To assess the stability and release kinetics of drugs, including proteins, from cubic phase matrices.

Main Methods:

• Review of existing literature on lipid-based drug delivery systems.
• Analysis of the structural properties of cubic phases using spectroscopic techniques.
• Evaluation of drug incorporation, stability, and release profiles from cubic phase formulations.
• Assessment of phase behavior and potential transformations upon drug incorporation.

Main Results:

• Cubic phases demonstrate the ability to incorporate and control the release of drugs with varying sizes and polarities.
• Incorporated proteins often retain native conformation and bioactivity, protected by the biomembrane-like environment.
• Drug release typically follows diffusion-controlled kinetics, described by Higuchi's square root of time model.
• Drug incorporation can induce phase transformations, influencing release characteristics.

Conclusions:

• Liquid crystalline cubic phases are promising drug delivery matrices due to their biodegradability, tunable phase behavior, and drug stabilization properties.
• Their unique structure and biomembrane-like nature enhance the stability of incorporated therapeutic agents.
• Limitations include shorter release durations and high viscosity, suggesting suitability for specific applications like local and short-acting systemic delivery.