From: Optimization of phenolics and flavonoids extraction conditions of Curcuma Zedoaria leaves using response surface methodology
Variables
Units
Coded & uncoded level of variables
−α
−1
0
1
+α
Temperature, X 1
°C
53
60
70
80
87
Time, X 2
Min
66
100
120
133
Solvent ratio, X 3
Ethanol:water
v/v%
63
90
97