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. Author manuscript; available in PMC: 2008 Jul 1.
Published in final edited form as: Cancer Epidemiol Biomarkers Prev. 2007 Jul;16(7):1503–1509. doi: 10.1158/1055-9965.EPI-07-0305

Figure 5.

Figure 5

Structure and electrospray ionization spectra of dG-C8-MeIQx (top two panels) and dG-C8-MeIQx-D3 (bottom two panels) showing [M+H]+ = 479 and 482, respectively. Collision induced dissociation fragmentation of dG-C8-MeIQx and d3 dG-C8-MeIQx at −50 V collision energy shows fragmentation of the MeIQx and guanosine moieties dominated by the major fragment produced from loss of deoxyribose: the aglycone ion of m/z 363 or 366 for dG-C8-MeIQx and dG-C8-MeIQx-D3, respectively. The collision energy was −25 V for MRM transitions used during quantitation.