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Effects of EDTA on End-Point Detection Methods01:18

Effects of EDTA on End-Point Detection Methods

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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...
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Coagulation01:06

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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Coagulation01:09

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The coagulation phase is a critical part of the body's process to prevent blood loss following injury to blood vessels. It involves chemical reactions that form a clot to seal the injured area. The clotting process begins shortly after injury, within 15-20 seconds for severe damage and 1-2 minutes for minor injuries.
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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
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Measurement of Tissue Non-Heme Iron Content using a Bathophenanthroline-Based Colorimetric Assay
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Sonoclot(®)-based method to detect iron enhanced coagulation.

Vance G Nielsen1, Jon Henderson2

  • 1Department of Anesthesiology, The University of Arizona College of Medicine, 1501 North Campbell Avenue, P.O. Box 245114, Tucson, AZ, 85724-5114, USA. vgnielsen333@gmail.com.

Journal of Thrombosis and Thrombolysis
|October 27, 2015
PubMed
Summary

A new Sonoclot method detects iron-induced hypercoagulability, unaffected by carbon monoxide. This advances coagulation analysis in inflammatory conditions like sickle cell disease, offering a more precise tool for iron-related clotting assessments.

Keywords:
Carbon monoxideHypercoagulabilityIronViscoelasticityViscosity

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Area of Science:

  • Biomedical Engineering
  • Hematology
  • Clinical Chemistry

Background:

  • Thrombelastography (TEG) methods detect iron-mediated hypercoagulability in various clinical settings.
  • Carbon monoxide (CO), a byproduct of heme oxygenase in inflammatory conditions, also affects TEG variables, potentially confounding iron assessment.
  • Existing methods lack specificity in differentiating iron's procoagulant effects from CO's influence.

Purpose of the Study:

  • To introduce a novel Sonoclot-based method for detecting iron-enhanced coagulation.
  • To develop a method for assessing iron-mediated hypercoagulability that is independent of carbon monoxide interference.
  • To provide a more specific diagnostic tool for iron-related hypercoagulability in clinical settings.

Main Methods:

  • Development and application of a Sonoclot analyzer-based assay.
  • Experimental design to isolate and measure iron-mediated coagulation effects.
  • Comparative analysis with thrombelastographic methods in the presence of potential confounding factors.

Main Results:

  • A novel Sonoclot method was successfully established to detect iron-enhanced coagulation.
  • The developed method demonstrated independence from carbon monoxide influence.
  • This technique offers a potential alternative to thrombelastography for specific iron assessment.

Conclusions:

  • The novel Sonoclot method provides a CO-independent means to assess iron-mediated hypercoagulability.
  • This advancement may improve diagnostic accuracy in conditions where both iron and CO contribute to coagulation changes.
  • Further clinical validation is necessary to compare its sensitivity and utility against thrombelastographic techniques.