Optimization of the Extraction of the Volatile Fraction from Honey Samples by SPME-GC-MS, Experimental Design, and Multivariate Target Functions

Table 1

Experimental domain investigated: low (−), intermediate (0), and high (+) levels adopted for each experimental factor.

	Extr. temperature; ()	Extr. time; ()	Amount of salt; (salt)
Exp 1	−	−	−
Exp 2	+	−	−
Exp 3	−	+	−
Exp 4	+	+	−
Exp 5	−	−	+
Exp 6	+	−	+
Exp 7	−	+	+
Exp 8	+	+	+
Exp 9	0	0	0
	Experimental domain
	(°C)	(min)	Salt (% w/w honey)
−	50	20	0
+	70	60	27.50
0	60	40	13.75