Improved fluorescent determination method of cellular sphingoid bases in high-performance liquid chromatography

Area of Science:

• Biochemistry
• Analytical Chemistry
• Cancer Research

Background:

• Sphingoid bases like sphingosine and sphinganine are crucial biomarkers in cellular processes.
• Accurate quantification of sphingoid bases is essential for understanding diseases, including cancer.
• Existing detection methods may lack sufficient sensitivity for certain applications.

Purpose of the Study:

• To develop a highly sensitive precolumn orthophthaldehyde (OPA) labeling method for sphingoid bases.
• To optimize conditions for enhanced fluorescent detectability of sphingoid bases.
• To apply the improved method for quantifying sphingoid bases in human lung cancer cells.

Main Methods:

• Investigated optimal pre-incubation solvents and heating procedures for OPA derivatization.
• Utilized high-performance liquid chromatography (HPLC) for separation and detection.
• Optimized OPA derivatization time, temperature, and storage conditions for stability.

Main Results:

• Pre-incubation in ethanol at 60°C for 30 minutes significantly increased fluorescent peak height.
• Achieved approximately a ten-fold increase in detectability for sphingoid bases.
• Established a detection limit of 0.1 pmol for sphingosine and demonstrated method stability for two weeks.

Conclusions:

• The optimized OPA labeling method significantly enhances fluorescent detectability of sphingoid bases.
• This method provides a sensitive and stable approach for quantifying sphingoid bases.
• The procedure is promising for analyzing sphingoid bases in various cancer cell types.