Related Experiment Videos
Urinary organic acid screening by solid-phase microextraction of the methyl esters
H M Liebich1, E Gesele, J Wöll
1Medizinische Universitätsklinik, Tübingen, Germany.
Journal of Chromatography. B, Biomedical Sciences and Applications
|September 24, 1998
Summary
We developed a rapid, simple method for analyzing urine organic acids using gas chromatography (GC) or GC-MS. This technique minimizes analyte loss and preparation time, enabling efficient profiling of urinary organic acids.
Area of Science:
- Analytical Chemistry
- Biochemistry
Background:
- Accurate profiling of organic acids in urine is crucial for diagnosing metabolic disorders.
- Existing sample preparation methods can be time-consuming and prone to analyte loss.
Purpose of the Study:
- To develop a novel, efficient sample preparation method for urinary organic acid analysis.
- To simplify the process and reduce analysis time for gas chromatography (GC) or GC-MS.
Main Methods:
- Direct derivatization of urine organic acids using trimethyloxonium tetrafluoroborate.
- Solid-phase microextraction (SPME) with a polyacrylate fiber for analyte extraction.
- Direct transfer of methyl esters to GC or GC-MS for analysis.
Main Results:
- The method avoids evaporation and organic solvent use, minimizing contamination and analyte loss.
- Total sample preparation time is approximately 40 minutes, significantly faster than other methods.
- Gas chromatography provided good separation of urinary organic acids, with 29 substances identified by GC-MS.
Conclusions:
- The developed method offers a simple, rapid, and efficient approach for urinary organic acid profiling.
- This technique enhances the feasibility of routine GC or GC-MS analysis of urine samples.
- The method's efficiency and reduced risk of analyte loss make it suitable for clinical diagnostics.