Development of a new HPLC-based method for 3-nitrotyrosine quantification in different biological matrices

Area of Science:

• Biochemistry
• Analytical Chemistry
• Biomedical Science

Background:

• Nitration of tyrosine residues produces 3-nitrotyrosine (3-NT), a biomarker linked to nitrosative stress and various health conditions.
• Accurate quantification of 3-NT in biological samples is crucial for understanding its physiological and pathological roles.
• Existing methods for 3-NT quantification require improvement in terms of simplicity, speed, and cost.

Purpose of the Study:

• To develop a simple, rapid, low-cost, and sensitive high-performance liquid chromatography (HPLC)-based method for quantifying 3-nitrotyrosine (3-NT).
• To validate the developed method for serum samples and assess its applicability to other biological matrices.

Main Methods:

• High-performance liquid chromatography (HPLC) system (Hitachi LaChrom Elite®) was utilized.
• Method validation was performed according to International Conference on Harmonisation (ICH) guidelines for serum.
• The method was tested on diverse biological matrices including whole blood, urine, cell lines, and microbial suspensions.

Main Results:

• An optimized mobile phase (0.5% CH3COOH:MeOH:H2O, 15:15:70) and detection at 356nm yielded optimal results.
• The method demonstrated a linear calibration curve, low limits of detection and quantification (μgL⁻¹), and rapid analysis time (<15 min).
• Successful detection and quantification of 3-NT were achieved across all tested biological matrices.

Conclusions:

• The developed HPLC method is simple, rapid, cost-effective, and sensitive for 3-NT quantification.
• The method's versatility across multiple biological matrices makes it suitable for both research and diagnostic applications.
• This validated assay provides a valuable tool for advancing the study of nitrosative stress and related conditions.