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Related Experiment Videos

Hemoglobin effects in the Saville assay.

Swati Basu1, Jared D Hill, Howard Shields

  • 1Department of Physics, Wake Forest University, Winston-Salem, NC 27109-7507, USA.

Nitric Oxide : Biology and Chemistry
|March 3, 2006
PubMed
Summary

Accurate measurement of nitrosothiols is crucial. This study demonstrates that hemoglobin addition to the Saville assay decreases, not increases, its sensitivity for nitrosothiol detection.

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Clinical Chemistry

Background:

  • Accurate quantification of nitrosothiols is essential for biological and clinical research.
  • Existing methodologies for nitrosothiol measurement exhibit significant variability, leading to discrepancies in reported basal levels.
  • The Saville assay is a recognized method but often lacks sufficient sensitivity for low-concentration analytes.

Purpose of the Study:

  • To investigate the effect of hemoglobin on the sensitivity of the Saville assay for nitrosothiol measurement.
  • To clarify conflicting reports regarding hemoglobin's role in enhancing nitrosothiol detection.

Main Methods:

  • Utilized the Saville assay for nitrosothiol quantification.
  • Varied hemoglobin concentrations within the reaction mixtures.

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  • Compared assay sensitivity with and without sufficient hemoglobin.

    • Main Results:

    • Contrary to recent suggestions, the presence of sufficient hemoglobin significantly decreased the sensitivity of the Saville assay.
    • Hemoglobin interfered with the reaction, reducing the assay's ability to detect low levels of nitrosothiols.
    • This finding challenges the proposed method for enhancing nitrosothiol detection.

    Conclusions:

    • Hemoglobin does not enhance, but rather impairs, the sensitivity of the Saville assay for nitrosothiols.
    • Further research is needed to develop sensitive and accurate methods for nitrosothiol quantification.
    • Standardization of methodologies is critical to resolve discrepancies in nitrosothiol level reporting.