Optimization of phenolics and flavonoids extraction conditions of Curcuma Zedoaria leaves using response surface methodology

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

Variables	Units	Coded & uncoded level of variables
Variables	Units	−α	−1	0	1	+α
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

ISSN: 2661-801X