Interface-driven Sr-morin complexation at Langmuir monolayers for bioactive coating design

Area of Science:

• Biomaterials Science
• Supramolecular Chemistry
• Surface Chemistry

Background:

• Flavonoid-metal complexes are known for luminescent and biological properties.
• Investigating flavonoid complexation within lipid membranes is underexplored but crucial for understanding biological activity and designing novel supramolecular structures.

Purpose of the Study:

• To investigate strontium-morin complexation within an octadecylphosphonic acid (OPA) Langmuir monolayer.
• To explore the potential of these complexes as bioactive coatings for implants, focusing on osteointegration.

Main Methods:

• Surface pressure isotherms to monitor morin incorporation and Sr2+ complexation in OPA monolayers.
• Electronic absorption spectroscopy and fluorescence techniques to confirm Sr-morin complexation.
• Langmuir-Blodgett (LB) film deposition on titanium surfaces.

Main Results:

• Sr-morin complexation was successfully achieved within the OPA Langmuir monolayer at the air-liquid interface, even under conditions where it typically doesn't occur in solution.
• OPA/Sr-morin coatings on titanium exhibited increased surface free energy and polarity.
• These enhanced surface properties promoted serum protein adsorption and osteoblast growth and differentiation.

Conclusions:

• Flavonoid-metal complexation within lipid membranes is feasible and can be driven by interfacial thermodynamics.
• OPA/Sr-morin coatings show significant promise for developing bioactive surfaces for medical implants, enhancing osteointegration.
• This research opens avenues for understanding flavonoid roles at membranes and designing advanced biomaterials.