Applied Biological Chemistry

Table 1 The five levels of the independent variables used in central composite design

From: Optimizing the extraction of essential oil from cinnamon leaf (Cinnamomum verum) for use as a potential preservative for minced beef

	Symbol	Coded level
	Symbol	− α	− 1	0	+ 1	+ α
Time (min)	A	89.319	120	165	210	240.88
Temperature (^oC)	B	103.296	105	110	115	111.704
Feed mass (g)	C	401.928	300	450	600	100.928

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