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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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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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Ion-Exchange Chromatography01:09

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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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Size-Exclusion Chromatography01:08

Size-Exclusion Chromatography

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In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
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Affinity chromatography is a powerful technique extensively utilized for separating and purifying specific biomolecules from complex mixtures. It capitalizes on the highly selective binding between an analyte and its counterpart, such as antibody-antigen interactions. The counterpart is immobilized on the stationary phase, forming an affinity column. The stationary phase typically consists of solid support, such as agarose or porous glass beads, immobilizing the affinity ligand. The mobile...
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Related Experiment Video

Updated: May 10, 2025

Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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Constraints on lanthanide separation by selective biosorption.

Carter Anderson1, Sean Medin2, James L Adair2

  • 1Department of Physics, Williams College, Williamstown, MA 01267, USA.

Iscience
|April 25, 2025
PubMed
Summary
This summary is machine-generated.

Genetic modifications in microbes can significantly improve lanthanide separation for sustainable energy technologies. Theoretical models show these biological methods offer faster separation times and potential for high-purity rare earth element recovery.

Keywords:
BiotechnologyChemistry

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Area of Science:

  • Biotechnology and Environmental Science
  • Materials Science and Engineering

Background:

  • Lanthanides are critical for sustainable energy technologies, necessitating efficient separation methods.
  • Microbial biosorption offers a promising alternative to traditional solvent extraction for lanthanide separation.
  • Genetic engineering of microorganisms, such as *Shewanella oneidensis* and *Vibrio natriegens*, enhances lanthanide biosorption selectivity.

Purpose of the Study:

  • To theoretically evaluate the industrial feasibility of microbial biosorption for lanthanide separation.
  • To model the impact of genetic modifications on the efficiency and selectivity of lanthanide recovery.
  • To explore strategies for achieving high-purity lanthanide separation using biological methods.

Main Methods:

  • Development of three theoretical models simulating lanthanide biosorption and desorption processes.
  • Analysis of the effects of single-locus and multi-locus genetic mutations on microbial separation efficiency.
  • Modeling of a multi-microbe system for sequential enrichment and purification of lanthanides.

Main Results:

  • Single genetic mutations can reduce lanthanide separation time by up to 25%.
  • Multi-locus modifications show potential for up to 90% reduction in separation time.
  • High-purity separation may require larger genetic modifications or multi-microbe approaches, depending on binding site availability.

Conclusions:

  • Genetically engineered microbes show significant promise for efficient and potentially faster lanthanide separation.
  • Theoretical models suggest that tailored genetic strategies can optimize biosorption processes for industrial application.
  • Multi-microbe systems offer a viable alternative for achieving high-purity lanthanide separation, complementing genetic enhancements.