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Related Concept Videos

Effects of EDTA on End-Point Detection Methods01:18

Effects of EDTA on End-Point Detection Methods

272
Different methods, such as visual observance of metal-ion indicators, spectroscopic techniques, and potentiometric methods, can determine the endpoint of an EDTA titration.
In the visual method, metal-ion indicators (metallochromic dyes), which have distinct colors in their free and complex forms, are added to the mixture to signal the titration's end point. They form stable complexes with metal ions, but these complexes are weaker than the corresponding metal–EDTA complexes. As a...
272
Masking and Demasking Agents01:19

Masking and Demasking Agents

2.4K
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.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on...
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Enzyme-Linked Immunosorbent Assay01:33

Enzyme-Linked Immunosorbent Assay

13.0K
In 1971, Peter Perlman and Eva Engvall developed an Enzyme-linked immunosorbent assay (ELISA or EIA). ELISA differs from western blot in that the assays are conducted in microtiter plates or in vivo rather than on an absorbent membrane.
There are many different types of ELISAs, but they all involve an antibody molecule whose constant region binds an enzyme, leaving the variable region free to bind its specific antigen.  Enzyme-substrate reaction allows the antigen to be visualized or...
13.0K
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

948
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...
948
EDTA: Direct, Back-, and Displacement Titration01:30

EDTA: Direct, Back-, and Displacement Titration

2.8K
The EDTA titration types for metal ion analysis include direct titration, back-titration, and replacement titration.
Direct titration involves buffering the metal ion solution to the desired pH and directly titrating with standard EDTA until the endpoint. The optimum pH ensures a large conditional formation constant of metal−EDTA and visibility of the free indicator color in the solution. In addition, auxiliary complexing reagents are used to prevent the precipitation of metal hydroxides...
2.8K
EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

586
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...
586

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Related Experiment Video

Updated: Jun 30, 2025

Phthalic Acid Ester-Binding DNA Aptamer Selection, Characterization, and Application to an Electrochemical Aptasensor
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A facile electrochemical immunosensor based on EDTA-Pb2+ complexation reaction.

Shuli Zhang1, Ze Zhang1, Qichen Xiong1

  • 1Department of Chemistry, Capital Normal University, Beijing, 100048, China.

Talanta
|March 24, 2024
PubMed
Summary

A new, affordable electrochemical immunosensor utilizes ethylenediaminetetraacetic acid (EDTA) and lead (Pb2+) complexation for rapid detection. This method achieves high sensitivity for biomarkers like prostate-specific antigen within minutes.

Keywords:
EDTA-Pb(2+) complexation reactionElectrochemical sensorMagnesium silicate hydratePolydopamineProstate-specific antigen

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Area of Science:

  • Electrochemistry
  • Biosensing
  • Materials Science

Background:

  • Electrochemical (EC) sensors offer high sensitivity but are often limited by cost and complex procedures.
  • Developing practical and affordable EC sensors remains a significant challenge in diagnostics.

Purpose of the Study:

  • To design a facile and affordable electrochemical immunosensor based on ethylenediaminetetraacetic acid (EDTA)-Pb2+ complexation.
  • To demonstrate the sensor's capability for sensitive and rapid detection of biomarkers.

Main Methods:

  • Utilized Pb2+-magnesium silicate hydrate as the sensing substrate.
  • Employed antibody-functionalized Pb2+-polydopamine as the immunoprobe.
  • Leveraged EDTA-Pb2+ complexation reaction for signal generation.

Main Results:

  • Achieved a low limit of detection of 30.49 fg mL-1 for prostate-specific antigen.
  • Demonstrated assay results within 24 minutes, significantly faster than existing EC sensors.
  • The reduction in EC signal of Pb2+ correlated with antigen concentration.

Conclusions:

  • The developed immunosensor offers a cost-effective and rapid alternative for biomarker detection.
  • The EDTA-Pb2+ complexation strategy provides a sensitive platform for electrochemical immunosensing.
  • This approach overcomes the limitations of traditional EC sensors, paving the way for broader applications.