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Fig. 3 | Progress in Earth and Planetary Science

Fig. 3

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

Fig. 3

Simplified metabolic map of degradation and synthetic networks of the amino acids (i.e., glycine, alanine, valine, leucine, isoleucine, glutamic acid, and phenylalanine) with respect to isotopic fractionation: a 15N/14N associated with deamination of amino acids and b 13C/12C associated with decarboxylation of pyruvic acid (Pyr) and α-ketoglutaric acid (α-Kg). 15N can be enriched in the six amino acids (i.e., glycine, alanine, valine, leucine, isoleucine, and glutamic acid), and 13C can be enriched in the three amino acids (i.e., glycine, alanine, and glutamic acid) and their precursors on the pathway

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