Skip to main content

Table 3 Possible factors for controlling trophic discrimination (Δ) and key reactions responsible for isotopic fractionation (ε) on consumers

From: A new insight into isotopic fractionation associated with decarboxylation in organisms: implications for amino acid isotope approaches in biogeoscience

  Possible factor for Δ of an amino acid Key reaction responsible for ε of an amino acid Classification of amino acids
Nitrogen Carbon Nitrogen Carbon
Aromatic - - - - Source
-Essential
Branched Deamination flux of the amino acid - Deamination of the amino acid - Trophic
-Essential
Others Balance between deamination and biosynthetic flux of the amino acid Biosynthetic flux of the amino acid Deamination of the amino acid Decarboxylation of the precursor (e.g., pyruvic acid and α-ketoglutaric acid) Trophic
-Nonessential