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

Figure 7

Comparison of three I.S.: % of peaks with CV% less than selected threshold levels (2, 5, 10, and 20) when o-tolualdehyde (o-tolu), 2,4,6-trimethylphenol (trime), and benzophenone (benzo) are used as I.S. for area correction: peaks eluting in the range 0–20 min (a), 20–40 min (b), and 40 min-end (c). The results are represented for Exp 7 ( = 60°C, = 60 min, and salt = 27.5%) and Exp 8 ( = 70°C, = 60 min, and salt = 27.5%).

(a)

(b)

(c)