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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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Poison can be effectively removed from the gastrointestinal (GI) tract through various decontamination procedures.
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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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Masking and Demasking Agents01:19

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EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
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Anthelminthic Agents01:15

Anthelminthic Agents

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Anthelmintic drugs differ significantly from antiparasitic therapies targeting protozoa, primarily due to differences in parasite biology. Whereas most protozoal treatments act on proliferating cells, anthelmintics are typically directed against mature, nonproliferative helminths. The therapeutic approach considers the helminth's reliance on neuromuscular coordination, glucose metabolism, and microtubular integrity for survival, reproduction, and localization within the host. Most anthelmintics...
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EDTA: Chemistry and Properties01:22

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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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Metabolically programmed iron chelators.

Raymond J Bergeron1, Neelam Bharti1, James S McManis1

  • 1JHMHC, Department of Medicinal Chemistry, University of Florida, Box 100485, Gainesville, FL 32610-0485, United States.

Bioorganic & Medicinal Chemistry
|August 2, 2015
PubMed
Summary
This summary is machine-generated.

Researchers developed metabolically programmed iron chelators for treating iron overload. These highly lipophilic drugs are orally absorbed and quickly convert to non-toxic forms, balancing efficacy and safety.

Keywords:
Metabolically programmed iron chelators

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Area of Science:

  • Medicinal Chemistry
  • Pharmacology
  • Toxicology

Background:

  • Structure-activity relationship (SAR) studies of desferrithiocin (DFT) analogs informed clinical trials for iron overload diseases like thalassemia.
  • Lipophilicity (logP(app)) significantly impacts iron chelator efficacy, distribution, and toxicity.
  • Optimizing iron chelators requires balancing lipophilicity, iron clearing efficiency (ICE), and toxicity.

Purpose of the Study:

  • Introduce 'metabolically programmed' iron chelators.
  • Design orally absorbable, highly lipophilic chelators that are rapidly converted to hydrophilic, non-toxic forms post-absorption.

Main Methods:

  • Investigated the impact of lipophilicity on iron chelator properties.
  • Developed novel DFT analogs with metabolic conversion capabilities.
  • Evaluated iron clearing efficiency, organ distribution, and toxicity profiles.

Main Results:

  • Established a correlation between lipophilicity and both iron clearing efficiency and toxicity.
  • Demonstrated that increased lipophilicity enhances ICE but also increases toxicity.
  • Introduced a novel strategy for designing safer and more effective iron chelators.

Conclusions:

  • Metabolically programmed iron chelators offer a promising approach to manage iron overload.
  • This strategy allows for high lipophilicity for absorption and rapid conversion to a safe, hydrophilic form.
  • Achieving a balance between lipophilicity, efficacy, and safety is crucial for developing effective iron overload treatments.