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Updated: Jun 13, 2026

Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

Published on: July 21, 2011

Cyclic Peptides for Lanthanide Binding.

Sina Chiniforoush¹, Oksana Fizer², Ana de Bettencourt-Dias²

¹Department of Chemical and Materials Engineering, University of Nevada, Reno, Reno, Nevada 89557, United States.

The Journal of Physical Chemistry. B

|October 7, 2025

Summary

This summary is machine-generated.

Researchers designed lanthanide-binding cyclic peptides (LBCPs) for improved separation of lanthanide ions. These novel peptides exhibit selective binding, particularly to middle lanthanides, offering a promising solution for lanthanide separation challenges.

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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

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Area of Science:

Chemistry
Biochemistry
Materials Science

Background:

Lanthanide ions possess similar chemical properties, making their separation challenging.
Nature's discovery of lanthanide-binding peptides and proteins has spurred interest in peptide-based separation methods.
Developing peptides with enhanced lanthanide binding and selectivity is crucial for efficient separation.

Purpose of the Study:

To design and characterize novel lanthanide-binding cyclic peptides (LBCPs).
To investigate the binding affinity and selectivity of LBCPs towards different lanthanide ions.
To elucidate the structural basis for lanthanide-binding selectivity.

Main Methods:

Molecular dynamics simulations were employed to design and predict peptide structures.
Electronic structure calculations provided insights into binding interactions.
Emission spectroscopy, including luminescent decay measurements, was used to determine coordination numbers and assess binding affinity.
Stability constants were measured to quantify binding strength.

Main Results:

Lanthanide-binding cyclic peptides (LBCPs) were successfully designed and characterized.
LBCPs demonstrated strong binding affinity (greater than micromolar) to Eu³⁺ ions.
Multiple peptides exhibited selective binding towards middle lanthanide ions.
A clear selectivity trend was observed: middle lanthanides > heavier lanthanides > lighter lanthanides.

Conclusions:

The designed LBCPs show significant potential for selective lanthanide ion separation.
Computational and experimental methods effectively assessed lanthanide-binding affinity and selectivity.
Understanding the structural basis of selectivity enables the design of highly specific lanthanide-binding agents.