Table 1. The central composite design for optimization of UAE condition for cumin
X
n
Response variables
Levels
-2
-1
0
+1
+2
X
1
Extraction temperature (°C)
15
30
45
60
75
X
2
Ethanol concentration (%)
0
20
40
60
80
X
3
Extraction time (min)
15
30
45
60
75