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Table 4 Independent test variables and their coded and uncoded value used for CCD matrix

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
Temperature, X 1  °C 53 60 70 80 87
Time, X 2 Min 66 80 100 120 133
Solvent ratio, X 3
Ethanol:water
v/v% 63 70 80 90 97