Table 9.

Regression coefficients and their significances for 2-PE production from the results of the BBD

Source	Sum of Squares	df	Mean square	F-Value	P-Value	Significant
Model	2.42	9	0.2691	16.72	0.0006	**
A-pH	0.5671	1	0.5671	35.24	0.0006	**
B-L-Phe concentration	0.5000	1	0.5000	31.07	0.0008	**
C-Loading volume	0.2016	1	0.2016	12.53	0.0095	**
AB	0.0110	1	0.0110	0.6851	0.4352
AC	0.0169	1	0.0169	1.05	0.3396
BC	0.0090	1	0.0090	0.5608	0.4783
A2	0.2056	1	0.2056	12.78	0.0090	**
B2	0.5874	1	0.5874	36.50	0.0005	**
C2	0.2151	1	0.2151	13.36	0.0081	**
Residual	0.1127	7	0.0161
Lack of Fit	0.0928	3	0.0309	6.22	0.0548	Not significant
Pure Error	0.0199	4	0.0050
Cor Total	2.53	16
	R2 = 0.9555	R2Adj = 0.8984	CV = 2.77%

“**”Significant at 1% level (P < 0.01)