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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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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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Phase II Reactions: Miscellaneous Conjugation Reactions01:19

Phase II Reactions: Miscellaneous Conjugation Reactions

441
Phase II biotransformations are detoxification mechanisms that conjugate xenobiotics with endogenous substances, neutralizing their toxicity.
A key example involves the conjugation of cyanide ions, which impair cellular respiration and alter hemoglobin into non-oxygen-carrying cyanmethemoglobin. To neutralize this threat, a sulfur atom from thiosulphate is transferred to the cyanide ion, catalyzed by the enzyme rhodanese, resulting in an inactive compound called thiocyanate. The production of...
441
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

1.5K
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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Immunogold Electron Microscopy01:20

Immunogold Electron Microscopy

5.7K
Immunoelectron microscopy utilizes immunogold labeling of endogenous proteins with specific antibodies to detect and localize these proteins in cells and tissues. The procedure provides insights into the distribution and quantification of protein under different stimulation conditions offering clues about their functions. Conjugating highly electron-dense gold particles with primary or secondary antibodies allow antigen detection on and within cells, with high resolution and specificity.
5.7K
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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Luminophore Formation in Various Conformations of Bovine Serum Albumin by Binding of GoldIII
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Bioactive gold(i) complexes with 4-mercaptoproline derivatives.

Alejandro Gutiérrez1, Carlos Cativiela, Antonio Laguna

  • 1Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, E-50009 Zaragoza, Spain. gimeno@unizar.es.

Dalton Transactions (Cambridge, England : 2003)
|August 9, 2016
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Summary

New gold(I) bioconjugates using 4-mercaptoproline show potent anticancer activity. These novel gold complexes exhibit significant cytotoxic effects against various human tumor cell lines, paving the way for advanced cancer therapeutics.

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Synthesis, Assembly, and Characterization of Monolayer Protected Gold Nanoparticle Films for Protein Monolayer Electrochemistry
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Area of Science:

  • Bioinorganic Chemistry
  • Medicinal Chemistry
  • Organic Synthesis

Background:

  • Gold(I) complexes are investigated for their therapeutic potential, particularly in cancer treatment.
  • Developing novel ligands for gold complexes can enhance their efficacy and selectivity.
  • Non-proteinogenic amino acids offer unique structural features for bioconjugate design.

Purpose of the Study:

  • To synthesize and characterize novel gold(I) bioconjugates incorporating 4-mercaptoproline derivatives.
  • To evaluate the in vitro cytotoxic activity of these gold(I) complexes against human cancer cell lines.
  • To explore structure-activity relationships for the design of improved gold(I) anticancer agents.

Main Methods:

  • Synthesis of Boc-protected 4-mercaptoproline derivatives.
  • Complexation of gold(I) precursors with modified amino acid ligands.
  • In vitro cytotoxicity assays using A549, Jurkat, and MiaPaca2 cell lines.
  • Structural modifications and derivative synthesis of gold(I) complexes.

Main Results:

  • Successful synthesis of unprecedented gold(I) bioconjugates with 4-mercaptoproline ligands.
  • All synthesized complexes demonstrated potent in vitro cytotoxic activity against tested tumor cell lines.
  • IC50 values ranged from low micromolar to nanomolar concentrations, indicating high efficacy.
  • Structure-activity relationship analysis provided insights into the design of more effective agents.

Conclusions:

  • The prepared gold(I) bioconjugates exhibit significant anticancer potential.
  • 4-Mercaptoproline serves as a versatile scaffold for developing novel gold-based anticancer drugs.
  • Further optimization based on SAR could lead to highly potent and selective gold(I) anticancer agents.