Five levels of independent variables of central composite design.
|Independent variables||Star low||Low||Centre||High||Star high|
|Extraction time (h)||3.32||4||5||6||6.68|
|Ethanol concentration (wt.%)||69.18||76||86||96||100|
|Ethanol volume (mL)||431.82||500||600||700||768.18|
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