Table 2.

Taguchi design matrix and corresponding butanol production by Clostridium acetobutylicum (MTCC 481) in shake flask

Experimental run no.	Parameters (factor)				Butanol (g L−1)	S/N ratio (dB)
	Yeast extract (g L−1)	PABA (mg L−1)	Sodium acetate (g L−1)	MgSO4 (g L−1)
1	1 (3)	1 (2)	1 (3)	1 (0.2)	2.14	6.13
2	1 (3)	1 (2)	2 (5)	2 (0.5)	2.38	7.15
3	1 (3)	2 (4)	1 (3)	2 (0.5)	5.5	14.61
4	1 (3)	2 (4)	2 (5)	1 (0.2)	3.28	10.02
5	2 (5)	1 (2)	1 (3)	2 (0.5)	0.99	−0.62
6	2 (5)	1 (2)	2 (5)	1 (0.2)	1.5	3.27
7	2 (5)	2 (4)	1 (3)	1 (0.2)	1.45	2.41
8	2 (5)	2 (4)	2 (5)	2 (0.5)	1.44	2.18