Improvement of Soybean Oil Solvent Extraction through Enzymatic Pretreatment

Table 1

Natural variables and factor levels. Coded variables: 𝑋₁ = (T-50): 20; 𝑋₂ = (pH-5.8): 0.8; 𝑋₃ = (𝑡-8): 4.

Natural variables	Factor levels
	−1.682	−1	0	+1	+1.682
Temperature (T) (°C)	16.4	30	50	70	83.6
pH	4.45	5	5.8	6.6	7.15
Time (𝑡) (h)	1.3	4	8	12	14.7