Table 1.

Coded and real values of factors in the Box–Behnken experimental design.

Factor	Level of Factor
	−1	0	1
Oxacillin (X1, μg/mL)	0	50	100
Palmitic acid (X2, mg/mL)	0	0.75	1.5
Span85 (X3, %)	0	0.25	0.5