Table 4.

The influence of headspace to the control strain Cac-CON and the overexpressing NADH oxidase strain Cac-NOX

Products (g/L)	Headspace
	Cac-CON				Cac-NOX
	75 %	50 %	25 %	0 %	75 %	50 %	25 %	0 %
Acetone	5.12 ± 0.26	4.47 ± 0.22	5.08 ± 0.25	4.56 ± 0.23	4.90 ± 0.24	4.18 ± 0.21	2.99 ± 0.15	1.31 ± 0.07
Ethanol	2.07 ± 0.10	1.98 ± 0.10	2.11 ± 0.11	1.83 ± 0.09	0.77 ± 0.04	0.95 ± 0.05	0.48 ± 0.02	0.24 ± 0.01
Butanol	12.15 ± 0.61	11.96 ± 0.60	12.17 ± 0.61	11.78 ± 0.59	8.79 ± 0.44	8.37 ± 0.42	5.84 ± 0.29	3.29 ± 0.16
Acetic acid	0.84 ± 0.04	0.45 ± 0.02	0.52 ± 0.03	1.78 ± 0.09	1.56 ± 0.08	3.37 ± 0.17	1.91 ± 0.10	2.50 ± 0.12
Butyric acid	0.64 ± 0.03	0.28 ± 0.01	0.24 ± 0.01	0.32 ± 0.02	1.47 ± 0.07	0.32 ± 0.02	0.74 ± 0.04	0.45 ± 0.02

Each value is an average of three parallel replicates