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Chromatograms obtained upon LC-NSI-HRMS/MS-SRM analysis of human leukocyte DNA (14 μg, 1,4 μg on column) for 7-ethyl-Gua by the method described in the text. This sample contained 70.2 fmol/μmol Gua of 7-ethyl-Gua corresponding to 130 amol injected on column (1 μl injected out of a 10 μl sample). Panel (A), analyte; panel (B), internal standard. Results are shown with a 5 ppm mass tolerance.
