Biovalorisation of crude glycerol and xylose into xylitol by oleaginous yeast Yarrowia lipolytica

Table 5 Experimental codes, range and levels of the independent variables used for central composite design (CCD) experiments

Independent variables	Units	Symbol code	Coded value
Independent variables			+α	−1	0	1	−α
Xylose	g/L	X₁	5	20	35	50	65
YNB	% (w/v)	X₂	0.05	0.2	0.35	0.5	0.65
NH₄Cl	% (w/v)	X₃	0.05	0.2	0.35	0.5	0.65
Phosphate buffer	mM	X₄	2.5	35	67.5	100	132.5

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