Figure 2

(a) Two-dimensional representation of the normalized NMR and MS signals (i.e. EDC and EMC) of exemplary compounds in the artificial mixture over the 26 fractions. (b) EMC of the isobaric amino acids alanine and β-alanine at m/z of 88.04 ([M-H]^-) together with EDCs of alanine (1.48 ppm) and β-alanine (2.56 ppm).