Fig. 2.
Simultaneous LC-DAD-ESI/MS chromatograms of Mexican oregano extract: (A) UV at 350 nm, (B) PI 70 V, (C) PI 250 V, (D) NI 70 V, and (E) NI 250 V. Chromatographic conditions are described in Section 2.5. Values for Rt, UV λmax, and pseudo-molecular masses for each peak are listed in Table 1.
