Table 1.

Experimental Box-Behnken design and response actual value and predicted value matrix.

Standard	X1	X2	X3	Response
	Carbon source (%, w/v)	Nitrogen source (%, w/v)	pH	Carotenoid concentration (A470/ml)
				Actual value	Predicted value
1	5	5	7	0.024	0.025
2	15	5	7	0.029	0.030
3	5	15	7	0.029	0.027
4	15	15	7	0.027	0.026
5	5	10	6	0.027	0.027
6	15	10	6	0.029	0.029
7	5	10	8	0.026	0.026
8	15	10	8	0.028	0.028
9	10	5	6	0.027	0.025
10	10	15	6	0.023	0.024
11	10	5	8	0.025	0.024
12	10	15	8	0.021	0.023
13	10	10	7	0.030	0.029
14	10	10	7	0.030	0.029
15	10	10	7	0.028	0.029