Isolation, identification and quantitation of urinary organic acids

Area of Science:

• Analytical Chemistry
• Biochemistry

Background:

• Accurate profiling of urinary organic acids is crucial for diagnosing metabolic disorders.
• Comparing different isolation techniques is essential for optimizing analytical workflows.

Purpose of the Study:

• To compare the effectiveness of ion-exchange and solvent extraction methods for isolating urinary organic acids.
• To evaluate the performance of the HISLIB program in analyzing gas chromatographic-mass spectrometric (GC-MS) data.

Main Methods:

• Utilized the HISLIB program to compare GC-MS profiles of urinary organic acids.
• Isolated compounds using both ion-exchange chromatography and solvent extraction techniques.
• Assessed the variety of compounds isolated and the precision of concentration measurements.

Main Results:

• Ion-exchange methods isolated a wider variety of organic acids compared to solvent extraction.
• Solvent extraction presented fewer practical difficulties, making it more suitable for rapid analyses.
• The precision of analysis was comparable between the two methods, with standard deviations of relative concentration between 10-30% for most compounds.

Conclusions:

• Ion-exchange chromatography offers superior compound recovery for comprehensive urinary organic acid profiling.
• Solvent extraction remains a practical choice for high-throughput or rapid analytical screening.
• The HISLIB program effectively facilitates the comparison of GC-MS profiles obtained from different isolation methods.