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Related Experiment Video

Updated: May 27, 2026

Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers

Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers

Published on: July 22, 2015

Coordination forces between lipid bilayers produced by ferricyanide and Ca2+.

María A Frías¹, Griselda Contis, Axel Hollmann

¹Laboratory of Physical-Chemistry of Lipid Membranes, School of Pharmacy and Biochemistry, Junín 956, University of Buenos Aires, Buenos Aires, Argentina.

Colloids and Surfaces. B, Biointerfaces

|November 29, 2011

Summary

Coordination forces, specifically involving ferricyanide and calcium ions, drive tight membrane aggregation. This interaction occurs when calcium ions bind to the membrane surface before ferricyanide, acting as a bridging agent.

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Area of Science:

Biophysics
Materials Science
Physical Chemistry

Background:

Membrane aggregation is typically driven by hydrogen bonding, cross-linking, and hydrophobic interactions.
The role of coordination forces in membrane-membrane interactions remains largely unexplored.
Coordination forces involve the formation of complexes between specific surface groups.

Purpose of the Study:

To investigate the formation of membrane aggregates mediated by coordination forces.
To explore the role of ferricyanide and calcium ions in phosphatidylcholine vesicle aggregation.
To elucidate the mechanism of coordination-driven membrane interactions.

Main Methods:

Surface potential measurements
Optical and electronic microscopy
Fourier-transform infrared (FTIR) spectroscopy
(1)H Nuclear Magnetic Resonance (NMR) spectroscopy

Main Results:

Ferricyanide, but not ferrocyanide, forms complexes with Ca(2+) pre-adsorbed on the membrane surface.
This complex formation leads to tight aggregation of phosphatidylcholine vesicles.
The anion acts as a bridge between opposing membranes, influenced by geometry and ligand polarizability.

Conclusions:

Coordination forces, mediated by ferricyanide and calcium ions, are a significant factor in membrane aggregation.
The specific adsorption sequence of ions is crucial for complex formation and aggregation.
This study highlights a novel mechanism for controlling membrane interactions through coordination chemistry.