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Related Concept Videos

Effects of EDTA on End-Point Detection Methods01:18

Effects of EDTA on End-Point Detection Methods

322
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...
322

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Nucleoside Triphosphates - From Synthesis to Biochemical Characterization
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Reducing COVID-19 diagnostic errors with dNTPαSe supplementation.

Jun Zhang1,2, Ling Tang1, Dan Liu1

  • 1Key Laboratory of Bio-Resource and Eco-environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan, China, 610064. hubei@scu.edu.cn.

The Analyst
|February 24, 2023
PubMed
Summary
This summary is machine-generated.

Selenium-modified nucleoside triphosphates (dNTPαSe) improve real-time reverse transcription polymerase chain reaction (RT-qPCR) tests for COVID-19. This enhancement reduces false negatives and increases accuracy for detecting SARS-CoV-2, even at low viral loads.

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Area of Science:

  • Molecular Biology
  • Virology
  • Biochemistry

Background:

  • Accurate COVID-19 diagnosis is crucial for pandemic control.
  • Real-time reverse transcription polymerase chain reaction (RT-qPCR) is a standard diagnostic method for SARS-CoV-2.
  • RT-qPCR exhibits a notable false-negative rate, especially with low viral loads.

Purpose of the Study:

  • To enhance the sensitivity and reduce the false-negative rate of RT-qPCR for COVID-19 diagnosis.
  • To evaluate the efficacy of selenium-modified nucleoside triphosphates (dNTPαSe) in RT-PCR reactions.

Main Methods:

  • Incorporation of selenium-modified nucleoside triphosphates (dNTPαSe) into RT-PCR reactions.
  • Testing with positive controls, pseudovirus, and clinical samples using commercial kits.
  • Analysis of Ct values, detection limits, specificity, sensitivity, and accuracy.

Main Results:

  • dNTPαSe supplementation generally resulted in lower Ct values.
  • Detection of viral loads down to single-digit copies was enabled.
  • Increased specificity, sensitivity, and accuracy of commercial diagnostic kits were observed, reducing false negatives.

Conclusions:

  • Supplementation with dNTPαSe significantly improves the performance of commercial RT-qPCR kits.
  • This method offers a convenient and efficient strategy for enhanced SARS-CoV-2 detection and diagnosis.
  • The approach effectively reduces the false-negative rate in COVID-19 testing.