Table 4.

Identification of volatile organic compounds produced by B. pumilus TM-R grown on four different media.

Peak	Retention Index	Compound	Identification∗	Detection in Medium
				NA	TSA	LBA	TMEA
1	458	Ethanol	annotated	+			+
2	671	2-Pentanone	identified		+	+	+
3	681	3-Methyl-1-butanamine	annotated	+	+		+
4	701	S-(−)-2-methylbutylamine	annotated	+			+
5	709	unidentified peak 1	unidentified		+
6	709	unidentified peak 2	unidentified	+
7	718	unidentified peak 3	unidentified	+
8	724	3-Methylbutanol	annotated				+
9	729	unidentified peak 4	unidentified				+
10	734	Methyl isobutyl ketone	identified	+	+	+	+
11	750	Ethyl 2-methylpropanoate	identified	+	+	+	+
12	755	Dimethyl disulfide	identified			+
13	803	unidentified peak 5	unidentified	+
14	814	3-Methyl-butanoic acid	annotated	+	+	+	+
15	825	Methyl pentanoate	identified	+	+	+	+
16	835	unidentified peak 6	annotated	+
17	849	Ethyl 2-methylbutanoate	identified	+	+	+	+
18	851	Ethyl 3-methylbutanoate	annotated		+	+	+
19	852	unidentified peak 7	unidentified	+
20	860	5-Methyl-2-hexanone	annotated	+	+	+	+
21	892	2-Heptanone	identified	+	+	+	+
22	925	2,5-Dimethylpyrazine	identified	+
	925	2,6-Dimethylpyrazine	identified	+
23	958	6-Methyl-2-heptanone	annotated	+	+	+	+
24	969	5-Methyl-2-heptanone	annotated	+	+	+	+
25	981	1-Octen-3-ol	identified		+
26	1160	2-Decanone	identified	+	+
27	1167	unidentified peak 8	unidentified	+	+
28	1262	Ethyl phenylacetate	identified	+	+		+
29	1345	Indole	annotated	+
	1345	5H-1-Pyrindine	annotated	+
30	1367	unidentified peak 9	unidentified	+
31	1373	unidentified peak 10	unidentified	+
32	1799	Octadecane	identified				+

^∗Compounds with a retention index match in aroma chemical databases (AromaOffice and/or Arochem Search) and high hit probabilities (≥70%) in the NIST library were considered to be identified. Compounds with matches in one of the three databases were considered to be annotated, while those with no matches were designated as unidentified.