A Systemic Problem in Metabolite Identification?
One of the most abundant metabolites in human urine has been misidentified in nearly half of published reports, study finds
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By
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James Strachan
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February 12, 2026
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1
Phenylacetylglutamine (PAGIn) has been misidentified as phenylacetylglycine (PAGly) in nearly half of NMR studies on human samples.
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The misidentification of PAG and PAGly has persisted despite correct assignments being known for decades.
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3
Errors in metabolite identification are widespread due to reliance on spectral databases and careless practices.
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Correct metabolite assignment is crucial for understanding biological pathways and ensuring accurate biomedical interpretations.
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The metabolomics community must implement rigorous validation processes to prevent similar misidentifications in the future.
