Nitrosothiol quantification in human plasma

Robert K. Goldman, Angelo A. Vlessis, Donald D. Trunkey

Research output: Contribution to journalArticlepeer-review

54 Scopus citations


A high-pressure liquid chromatography (HPLC) assay for measuring picomole quantities of nitrosothiol in biological samples was developed. The assay utilizes the catalytic reduction of nitrosothiol by mercuric cation (Hg2+). Released nitrogen oxide reacts with sulfanilamide (SA) and N-(1- napthyl)ethylenediamine (NNED) to form a stable azo dye. The azo dye is then separated from N-(1-napthyl)ethylenediamine and quantified by reversed-phase HPLC. In addition to nitrosothiol, nitrite and atmospheric nitrogen oxides are sources of nitrogen oxide that react with the reagents, SA and NNED, to form the azo dye. Therefore, a reference sample, which includes the nitrosothiol sample and all reagents except Hg2+, is utilized for the subtraction of nitrite and atmospheric nitrogen oxides which 'contaminate' the nitrosothiol sample and reagents. This method is a sensitive (~3 pmol; ~10-1 μM) and accurate means to measure nitrosothiol concentration in biologic samples.

Original languageEnglish (US)
Pages (from-to)98-103
Number of pages6
JournalAnalytical Biochemistry
Issue number1
StatePublished - May 15 1998

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


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