Global urinary metabolic profiling procedures using gas chromatography-mass spectrometry

Area of Science:

• Biochemistry
• Systems Biology
• Analytical Chemistry

Background:

• Urinary metabolic profiling is crucial for systems biology, clinical diagnostics, and personalized healthcare.
• Techniques like NMR, LC/MS, and GC/MS are used for metabolic profiling.
• Expanding applications necessitate efficient and comprehensive profiling methods.

Purpose of the Study:

• To describe a detailed protocol for urine collection, storage, and GC/MS analysis.
• To outline methods for data preprocessing, chemometric analysis, and metabolite identification.
• To present a protocol capable of profiling 400-600 metabolites in a high throughput manner.

Main Methods:

• Urine sample preparation includes urea depletion, protein precipitation, and trimethylsilyl derivatization.
• Gas chromatography-mass spectrometry (GC/MS) is employed for metabolite separation and detection.
• Chemometric analysis and established methods are used for data processing and metabolite identification.

Main Results:

• The protocol enables the metabolic profiling of approximately 400-600 metabolites per sample.
• The method supports high-throughput analysis, processing up to 120 urine samples weekly.
• GC/MS results are complementary to other metabolomic techniques like NMR and LC/MS.

Conclusions:

• This protocol provides a robust and efficient method for urinary metabolic profiling using GC/MS.
• The high throughput and comprehensive nature of the protocol support its application in large-scale studies.
• This method advances the utility of urinary metabolomics in systems biology, diagnostics, and personalized medicine.