Perforated bicontinuous cubic phases with pH-responsive topological channel interconnectivity.

Area of Science:

• Materials Science
• Biophysics
• Nanotechnology

Background:

• Lipidic lyotropic liquid crystals offer complex structures for stimuli-triggered release of therapeutic molecules.
• The reversed double diamond bicontinuous cubic phase (Pn3m symmetry) has independent water channels, limiting molecule transport.
• Engineering these mesophases is key for advanced drug delivery systems.

Purpose of the Study:

• To introduce a novel bicontinuous cubic phase with enhanced transport properties.
• To enable stimuli-triggered release and fine modulation of molecular transport.
• To explore new opportunities in targeted delivery of bioactive compounds.

Main Methods:

• Incorporation of OmpF membrane proteins into lipid bilayers.
• Small-angle X-ray scattering (SAXS) to analyze structural changes.
• Release and ion conductivity experiments to assess transport properties.
• Exploitation of pH-mediated pore-closing mechanisms.

Main Results:

• A novel perforated bicontinuous cubic phase with interconnected water channels was created.
• The engineered phase exhibits faster, sustained release of bioactive molecules compared to standard mesophases.
• The OmpF proteins enabled molecular active gating and pH-triggered pore modulation without altering channel size or symmetry.

Conclusions:

• The perforated bicontinuous cubic phase offers superior transport properties for drug delivery.
• pH-triggered control of molecular transport opens new avenues for targeted drug delivery.
• This engineered lipidic mesophase represents a significant advancement in controlled release technologies.