Figure 2.

(a) and (c) Separation of olive oils sold as extra virgin olive oil (EVOO) in Italy according to the origin of purchase in two-dimensional space defined by the first three principal components, PC1, PC2, and PC3. Green cycles represent monocultivar protected designation of origin (PDO)EVOO purchased on family farms, while red cycles represent commercially-blended EVOO purchased in supermarkets (b) and (d) Factor loadings of selected variables, i.e., concentrations or proportions of various lipid species, obtained by LC-ESI-MS/MS, LC-ESI-IT-MS, and ¹H-NMR, respectively, on PC1, PC2, and PC3.