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Related Concept Videos

EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Complexation Equilibria: The Chelate Effect01:19

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Extraction: Advanced Methods00:56

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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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EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

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EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
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Synthesis of Functionalized Magnetic Nanoparticles, Their Conjugation with the Siderophore Feroxamine and its Evaluation for Bacteria Detection
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Enzymatically Biodegradable Polyrotaxane-Deferoxamine Conjugates for Iron Chelation.

Zhi Liu1, Tien-Min Lin2, Max Purro1,2

  • 1Department of Pharmaceutical & Biomedical Sciences, College of Pharmacy, University of Georgia , Athens, Georgia 30602-2352, United States.

ACS Applied Materials & Interfaces
|September 14, 2016
PubMed
Summary

This study developed a novel polyrotaxane-deferoxamine (hPR-DFO) to improve iron chelation therapy. The new chelator reduces drug toxicity and effectively removes excess iron in vivo with minimal side effects.

Keywords:
biodegradablechelation therapydeferoxamineiron overloadpolyrotaxane

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Pharmacology

Background:

  • Current iron chelators like deferoxamine (DFO) have short circulation times and toxic side effects.
  • This necessitates frequent infusions and limits patient compliance.
  • Developing improved iron chelation strategies is crucial for managing iron overload disorders.

Purpose of the Study:

  • To synthesize and characterize a novel polyrotaxane-deferoxamine (hPR-DFO) conjugate.
  • To evaluate the in vitro and in vivo efficacy and safety of hPR-DFO for iron chelation therapy.
  • To assess the potential of hPR-DFO to overcome the limitations of conventional DFO treatment.

Main Methods:

  • Polyrotaxanes (PR) were synthesized using α-cyclodextrin (α-CD) threaded onto PEG-BA, capped with Z-L phenylalanine.
  • PR was conjugated to DFO and hydroxypropylated to form hPR-DFO.
  • Iron chelation was verified using UV-vis spectroscopy; degradation was confirmed by gel permeation chromatography.
  • In vitro studies used iron-overloaded macrophages; in vivo studies utilized iron-overloaded mice.

Main Results:

  • hPR-DFO demonstrated effective iron chelation and degraded into smaller fragments in the presence of protease.
  • In vitro, hPR-DFO reduced drug cytotoxicity while maintaining chelation efficacy in macrophages.
  • hPR-DFO showed enhanced cellular uptake and lysosomal trafficking in iron-overloaded cells.
  • In vivo, hPR-DFO treatment lowered serum ferritin levels and promoted iron excretion via renal and fecal routes.
  • No significant acute toxicological damage to the liver or spleen was observed.

Conclusions:

  • hPR-DFO represents a promising new approach for iron chelation therapy, offering improved efficacy and reduced toxicity.
  • The polyrotaxane platform enhances DFO delivery and clearance, addressing limitations of conventional treatments.
  • hPR-DFO facilitates efficient iron removal with a favorable safety profile, suggesting potential for clinical application.