Nitrosothiol quantification in human plasma

Area of Science:

• Analytical Chemistry
• Biochemistry
• Environmental Science

Background:

• Nitrosothiols are important biological molecules implicated in various physiological and pathological processes.
• Accurate quantification of nitrosothiols in biological matrices is crucial for understanding their roles.
• Existing methods for nitrosothiol detection may lack sensitivity or specificity.

Purpose of the Study:

• To develop a sensitive and accurate assay for measuring picomole quantities of nitrosothiol in biological samples.
• To establish a reliable method for quantifying nitrosothiol concentration in complex biological matrices.

Main Methods:

• Development of a high-pressure liquid chromatography (HPLC) assay.
• Utilizing catalytic reduction of nitrosothiol by mercuric cation (Hg2+).
• Quantification of a stable azo dye formed from released nitrogen oxide, sulfanilamide (SA), and N-(1-napthyl)ethylenediamine (NNED) via reversed-phase HPLC.

Main Results:

• The assay is highly sensitive, detecting approximately 3 pmol of nitrosothiol (approximately 10(-1) microM).
• A reference sample strategy effectively subtracts interference from nitrite and atmospheric nitrogen oxides.
• The method provides accurate quantification of nitrosothiol in biological samples.

Conclusions:

• The developed HPLC assay offers a sensitive and accurate means for measuring nitrosothiol concentrations in biological samples.
• This assay is valuable for research requiring precise quantification of nitrosothiols.
• The method addresses limitations of previous techniques by minimizing interference and enhancing sensitivity.