In Situ Quantification of Ammonia in Biofluids using High-Resolution Nuclear Magnetic Resonance

Area of Science:

• Biochemistry
• Analytical Chemistry
• Medical Diagnostics

Background:

• Ammonia is a vital metabolite with abnormal levels linked to various diseases.
• Accurate in situ ammonia quantification is essential for clinical diagnosis but faces challenges.
• Conventional methods suffer from reactant toxicity and interference from other amine analytes.

Purpose of the Study:

• To develop a simple, reliable method for in situ ammonia quantification.
• To overcome the limitations of existing ammonia detection techniques.
• To enable accurate ammonia measurement in complex biological matrices.

Main Methods:

• Utilized a series of 19F-Tags reactive to ammonia in aqueous solutions.
• Employed Nuclear Magnetic Resonance (NMR) spectroscopy for signal detection.
• Ensured well-resolved NMR signals distinct from other amine analytes.

Main Results:

• Successfully established a simple and reliable in situ ammonia quantification method.
• Demonstrated effective quantification of ammonia at micromolar concentrations.
• Validated the method in complex biofluid samples like cell lysates, human plasma, and urine.

Conclusions:

• The developed 19F-Tag NMR method provides a robust solution for in situ ammonia quantification.
• This technique offers a significant advancement over conventional methods, minimizing toxicity and interference.
• The method's applicability to various biofluids supports its potential for clinical diagnostics.