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. Author manuscript; available in PMC: 2011 Jan 1.
Published in final edited form as: Free Radic Biol Med. 2009 Oct 9;48(1):65. doi: 10.1016/j.freeradbiomed.2009.10.025

Figure 3.

Figure 3

LC-EPI chromatograms of a DHN-MA synthetic standard and a human urine sample. (A) Negative ion electrospray EPI scanning of m/z 320 of a standard reaction mixture of DHN-MA. (B) Negative ion electrospray EPI scanning of m/z 320 of a human urine sample. (C) The EPI spectrum of synthetic DHN-MA shows fragments with m/z 191, m/z 143, and m/z 173. (D) The EPI spectrum of endogenous DHN-MA in a human urine sample shows the same fragments as the synthetic DHN-MA sample, with m/z 191, m/z 143, and m/z 173.