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

Colloids and Surfaces. B, Biointerfaces
Marcos A E CruzAna P Ramos

Abstract

Flavonoid-metal complexes are widely studied because of their interesting luminescent behavior and biological activity. Despite the extensive exploration of flavonoid-metal coordination processes in solution, the formation of complexes using the flavonoid molecule inserted in a lipid membrane has been little investigated. This effect could provide important insight into the biological activity of flavonoids at lipid membranes and could represent an attractive strategy to design supramolecular structures. Here, we studied the complexation between Sr2+ and morin inserted in an octadecylphosphonic acid (OPA) Langmuir monolayer. This is a relevant system due to the synergism imposed by the association of the Sr2+ ability to control bone formation/resorption with the morin antioxidative effect. Morin incorporation into the OPA monolayers and further Sr2+ complexation were monitored by surface pressure isotherms. Electronic absorption spectroscopy and fluorescence techniques showed Sr-morin complexation both in solution and at the air-liquid interface. Although morin complexation has been described to occur only at basic pH, the specific thermodynamic properties at the air-liquid interface drove metal complexation. LB films were depo...Continue Reading

Citations

Apr 30, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Małgorzata JurakSantiago Martín
Nov 19, 2021·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·Lucas Fabricio Bahia NogueiraAna Paula Ramos

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