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LC/APCI-MS/MS chromatograms obtained in SRM mode of a pooled EBC sample spiked with a 25 nM mixture of derivatized aldehyde standards (a) and of an authentic EBC sample (b), for which separate SRM traces are shown (c)–(g). Chromatographic conditions: see Experimental. Peak identification and SRM transitions:1. MDA (m/z 235 →159), 2 4-HHE (m/z 293 →167), 3 acrolein(m/z 235 →163), 4 4-HNE (→ 335 →167), 5 n-hexanal (→ 279 →163), 6 n-heptanal (→ 293 →163), 8 n-nonanal (→ 3215 →163).
