Identification of Urine Organic Acids for the Detection of Inborn Errors of Metabolism Using Urease and Gas...

Area of Science:

• Biochemistry
• Metabolomics
• Clinical Chemistry

Background:

• Urine organic acid analysis is crucial for diagnosing inborn errors of metabolism.
• Traditional methods using solvent extraction and gas chromatography-mass spectrometry (GC/MS) lose neutral and positively charged compounds.
• This limitation hinders comprehensive metabolic profiling.

Purpose of the Study:

• To introduce an improved method for urine organic acid analysis.
• To overcome the limitations of traditional extraction methods by preserving a wider range of metabolites.
• To enhance the diagnostic capabilities for metabolic disorders.

Main Methods:

• Replaced traditional solvent extraction with enzymatic treatment using urease.
• Utilized gas chromatography-mass spectrometry (GC/MS) for separation and quantification.
• Analyzed a broad spectrum of organic molecules, including amino acids, acylglycines, neurotransmitters, and carbohydrates.

Main Results:

• The urease method allows for the analysis of a greater abundance and diversity of organic molecules compared to traditional methods.
• This enzymatic approach successfully identifies various classes of biochemical compounds previously lost during extraction.
• The method is effective for newborn screening follow-up and broader metabolic investigations.

Conclusions:

• Enzymatic urease treatment offers a significant advancement in urine organic acid analysis.
• This method expands the scope of detectable metabolites, aiding in the diagnosis of metabolic disorders.
• The urease approach is a valuable adjunct for comprehensive biochemical genetic analysis.