TABLE 1.

Volatile compounds produced by Bacillus subtilis ZD01 identified under optimal conditions using an free fatty acid phase (FFAP) chromatographic column.

No.	Chemicals	CAS	Retaining time (min)	SI	RSI	Peak area ratio (%)
1	3-Methyl-2-pentanone	565-61-7	7.27	863	913	3.32
2	2-Heptanone	110-43-0	10.22	867	877	4.42
3	6-Methyl-2-heptanone	928-68-7	11.46	888	892	22.27
4	5-Methyl-2-heptanone	18217-12-4	11.90	855	858	19.08
5	Methyl-pyrazine	109-08-0	12.41	939	941	6.65
6	2,5-Dimethylpyrazine	123-32-0	13.73	944	946	12.47
7	6-Methyl-2-heptanol	4730-22-7	14.58	874	885	3.53
8	2-Ethyl-5-methyl-pyrazine	13360-64-0	15.20	687	826	3.87
9	2-Methyl-5-(1-methylethyl)pyrazine	13925-05-8	15.81	845	975	2.00
10	2-Decanone	693-54-9	16.59	821	871	10.77
11	Acetophenone	98-86-2	21.90	639	863	4.70
12	2-Ethyl-6-methyl-phenol	1687-64-5	26.59	693	871	3.24
13	Phenylethyl alcohol	60-12-8	27.44	688	882	1.34
14	1,2-Benzisothiazole	272-16-2	28.63	772	922	0.53
15	2-Nonadecanone	629-66-3	30.45	731	869	1.81

SI, strength indexes; RSI, relative strength indexes.