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Extraction: Advanced Methods

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...

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Updated: Jul 28, 2025

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

Enhanced rare-earth separation with a metal-sensitive lanmodulin dimer.

Joseph A Mattocks¹, Jonathan J Jung¹, Chi-Yun Lin¹

¹Department of Chemistry, The Pennsylvania State University, University Park, PA, USA.

|May 31, 2023

Summary

This summary is machine-generated.

A newly discovered protein, Hans-LanM, uses rare-earth-sensitive dimerization to achieve highly selective separation of critical elements. This biological approach offers a sustainable alternative for rare-earth element purification.

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Published on: September 16, 2014

Area of Science:

Biochemistry and Biotechnology
Materials Science
Sustainable Chemistry

Background:

Separating rare-earth elements (REEs) is challenging due to subtle ionic property differences.
Conventional methods like solvent extraction are environmentally taxing.
Natural lanthanide-binding proteins (LanMs) offer a sustainable alternative for REE separation.

Purpose of the Study:

To characterize a novel lanmodulin (Hans-LanM) from Hansschlegelia quercus for REE separation.
To elucidate the structural basis of Hans-LanM's selective lanthanide binding and dimerization.
To engineer Hans-LanM for improved and practical REE separation.

Main Methods:

Biochemical characterization of Hans-LanM, including oligomeric state determination.
X-ray crystallography to visualize lanthanide-protein interactions and structural mechanisms.
Structure-guided site-directed mutagenesis and column-based chromatography for separation assays.

Main Results:

Hans-LanM exhibits rare-earth ionic radius-dependent dimerization, with a >100-fold tighter binding for lanthanum(III) than dysprosium(III).
X-ray structures reveal how subtle radius differences are amplified to the quaternary structure via a carboxylate shift and altered hydrogen-bonding network.
Mutagenesis enabled single-stage separation of neodymium(III)/dysprosium(III) mixtures to >98% purity.

Conclusions:

Hans-LanM demonstrates remarkable selectivity for lanthanides, exceeding that of previously studied LanMs.
Rare-earth-sensitive dimerization is a key biological principle for tuning biomolecule-based separation efficiency.
This study highlights natural protein diversity for developing sustainable and efficient REE separation technologies.