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. 2019 May 9;24(9):1791. doi: 10.3390/molecules24091791

Figure 2.

Figure 2

Figure 2

The primary mass spectrum for each of the seven phenolic acids in both positive and negative ESI modes: Chlorogenic acid (1) with (M + Na)+ at m/z 377 and (M − H)− at m/z 353, whereas caffeic acid (2) with (M + Na)+ at m/z 203 and (M − H)− at m/z 179, isochlorogenic acid B (3) with (M + Na)+ at m/z 539 and (M − H)− at m/z 515, isochlorogenic acid A (4) with (M + Na)+ at m/z 539 and (M − H)− at m/z 515, isochlorogenic acid C (5) with (M + Na)+ at m/z 539 and (M − H)− at m/z 549, caffeic acid phenethyl ester (6) with (M + Na)+ at m/z 307 and (M − H)− at m/z 283, and artepillin C (7) with (M + Na)+ at m/z 323 and (M − H)− at m/z 299.