Table 4.

BBD experiments design matrix and results of γ-PGA production.

Code	Aspartic acid (A)	Phenylalanine (B)	CEGA (C)	γ-PGA (g/L)
1	−1	1	0	32.74 ± 0.20
2	1	1	0	39.26 ± 0.25
3	−1	0	−1	28.71 ± 0.23
4	0	1	1	37.09 ± 0.20
5	0	1	−1	32.23 ± 0.22
6	1	−1	0	38.56 ± 0.33
7	1	0	−1	36.92 ± 0.35
8	0	0	0	35.75 ± 0.15
9	0	−1	−1	29.59 ± 0.33
10	−1	−1	0	28.07 ± 0.10
11	0	0	0	36.86 ± 0.33
12	0	0	0	36.63 ± 0.14
13	0	0	0	36.27 ± 0.15
14	0	0	0	36.04 ± 0.13
15	−1	0	1	36.10 ± 0.17
16	1	0	1	42.88 ± 0.30
17	0	−1	1	34.11 ± 0.25