Metabolite analysis in positron emission tomography studies: examples from food sciences

Area of Science:

• Radiochemistry and Nuclear Medicine
• Analytical Chemistry
• Food Science and Technology

Background:

• Positron emission tomography (PET) uses radiolabeled tracers to quantify tissue function.
• Quantitative PET analysis requires understanding the metabolic fate of these tracers.
• Metabolite analysis is essential for accurate interpretation of PET imaging and identifying metabolic pathway alterations.

Purpose of the Study:

• To highlight the importance of metabolite analysis for quantitative PET.
• To present representative radiolabeled compounds relevant to food science.
• To describe analytical methods and challenges for metabolite profiling.

Main Methods:

• Dynamic data acquisition protocols for PET imaging.
• Radio-High-Performance Liquid Chromatography (radio-HPLC) and Radio-Thin-Layer Chromatography (radio-TLC) for metabolite separation.
• Pre-analytical sample preparation for plasma, urine, and tissue.

Main Results:

• Demonstrated the application of radio-HPLC and radio-TLC for analyzing radiolabeled tracers.
• Presented results from plasma, urine, and tissue sample analyses.
• Discussed the metabolic fate of various tracers, including amino acids, polyphenols, and AGEs model compounds.

Conclusions:

• Metabolite analysis is indispensable for accurate quantitative PET imaging.
• The described methods are applicable to a range of radiolabeled compounds relevant to food science.
• Understanding tracer metabolism aids in image interpretation and pathological pathway identification.