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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 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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Complexometric Titration: Overview00:39

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Complexometric titration involves the formation of a complex by reacting a metal ion with one or more ligands. A visual indicator often detects the end point of a complexometric titration. It is added to the metal solution before the titration, forming a stable metal–indicator complex and imparting color to the solution. As the titration approaches the equivalence point, the excess of the added ligand displaces the indicator from the metal–indicator complex, releasing the free...
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Actin and myosin are contractile proteins that form the sarcomere found in skeletal muscle tissues for regulating muscle contraction. Actin, a globular contractile protein, interacts with myosin for muscle contraction. The skeletal tissue appears striped or striated under a microscope due to the repeated arrangement of contractile proteins actin and myosin along the length of myofibrils. Dark A bands and light I bands repeat along myofibrils, and the alignment of myofibrils in the cell causes...
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The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
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Troponin interference with special regard to macrocomplex formation.

Bernhard Strasser1, Josef Tomasits1, Alexander Fellner2

  • 1Institute of Laboratory Medicine, Kepler University Hospital Linz, Linz, Austria.

Clinical Chemistry and Laboratory Medicine
|October 19, 2021
PubMed
Summary
This summary is machine-generated.

Troponin biomarkers are crucial for diagnosing heart conditions but can yield false elevations. This review highlights macro-immune complex formation as a key interference factor causing inaccurate troponin results.

Keywords:
macro troponinmacro-immune complex formationtroponin artifacttroponin false positivetroponin interference

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Area of Science:

  • Cardiology
  • Clinical Chemistry
  • Laboratory Medicine

Background:

  • Troponin-T and troponin-I are established gold-standard biomarkers for diagnosing cardiological diseases.
  • Clinical guidelines recommend troponin analysis for diagnosis and prognosis in numerous cardiac conditions.
  • Elevated troponin levels can occur due to various medical circumstances beyond acute cardiac events.

Purpose of the Study:

  • To investigate and detail troponin artifacts, focusing on interference factors.
  • To specifically examine macro-immune complex formation as a significant cause of false troponin elevations.
  • To provide a comprehensive overview of interference in troponin testing.

Main Methods:

  • Conducted a literature search to identify relevant studies on troponin artifacts.
  • Focused on the period from 2006 to June 2021.
  • Analyzed literature concerning interference factors, particularly macro-immune complexes.

Main Results:

  • Identified macro-immune complex formation as a critical interference factor in troponin assays.
  • Documented various medical circumstances leading to spurious troponin elevations.
  • Highlighted the clinical significance of understanding these artifacts for accurate diagnosis.

Conclusions:

  • False troponin elevations due to artifacts, such as macro-immune complexes, can impact clinical decision-making.
  • Awareness of interference factors is essential for correct interpretation of troponin results.
  • Further research and improved assay methodologies may help mitigate these interference issues.