r12a Identified compounds A (petroleum) F  (bacteria) K (bacteria) Confirmedb
0.319 formic acid 0.01 0.03 0.03 *
0.406 acetic acid 0.02 0.12 0.17 *
0.570 methyl-propanoic  acid   0.03    
0.604 alanine     0.03  
0.608 dimethylsulfone     0.01 *
0.631 ethanediol 0.04     *
0.663 butanediol   0.02 0.03 *
0.672 lactic acid   0.74 0.30 *
0.694 alanine     0.01  
0.715 methyl butanol 0.01      
0.720 3-hydroxybutyric acid     0.02 *
0.722 oxypentanoic acid     0.02  
0.724 hydroxymethylbutyric acid   0.05    
0.736 pentenoic acid     0.03  
0.747 L-valine (bisTMS)     0.08 *
0.759 ethyl succinate     0.04 *
0.770 glycerol     0.04 *
0.773 phosphoric acid   0.10    
0.792 methyl succinic acid 0.03      
0.798 pyrimidine     0.02  
0.815 malic acid   0.03 0.08  
0.821 pentanedioic acid     0.02 *
0.854 malic acid 5.40 0.03 0.02  
0.860 hexanedioic acid   0.01   *
0.930 phthalic acid 0.03 0.05    
0.967 citric acid     0.07 *
0.992 heptanol derivative     0.04  
1.000 o-terphenyl (IS) 1.00 1.00 1.00 IS
1.012 glucose     0.02  
a Relative retention time (retention time/IS retention time)
b Confirmed using the analysis of standard.
Table 2: Contaminants and their percent responses, with respect to an internal standard, observed upon BSTFA derivatization of an ACN extract of petroleum produced succinic acid and initial process bio-based succinic acid samples