High-performance liquid-chromatographic analysis for tryptophan in serum

Area of Science:

• Biochemistry
• Analytical Chemistry
• Clinical Chemistry

Background:

• Accurate quantification of serum tryptophan is crucial for understanding various physiological and pathological processes.
• Existing methods for tryptophan determination may be time-consuming or require large sample volumes.

Purpose of the Study:

• To develop and validate a rapid, sensitive, and reliable method for determining total tryptophan concentrations in human serum.
• To establish a high-performance liquid chromatography (HPLC) based assay suitable for routine clinical analysis.

Main Methods:

• Serum protein precipitation using trichloroacetic acid.
• Extraction of excess trichloroacetic acid with a Freon/tri-N-octylamine solution.
• Quantification of tryptophan using reversed-phase partition high-performance liquid chromatography with ultraviolet and fluorescence detection.

Main Results:

• The method demonstrated high sensitivity with a limit of detection of 1 pmol for tryptophan.
• Tryptophan was eluted within 15 minutes, indicating a rapid analytical procedure.
• No significant interferences were observed from endogenous serum components, ensuring specificity.

Conclusions:

• The developed HPLC method provides a fast, sensitive, and specific approach for total serum tryptophan determination.
• This assay is suitable for analyzing small serum volumes (50 microliters) and can be applied in clinical settings.
• The method's efficiency and accuracy contribute to improved biochemical analysis of tryptophan.