DETERMINATION OF IN-VITRO FORMED DNA-ADDUCTS OF 2-AMINO-1-METHYL-6-PHENYLIMIDAZO[4,5-B]PYRIDINE USING CAPILLARY LIQUID-CHROMATOGRAPHY ELECTROSPRAY-IONIZATION TANDEM MASS-SPECTROMETRY
D. Rindgen et al., DETERMINATION OF IN-VITRO FORMED DNA-ADDUCTS OF 2-AMINO-1-METHYL-6-PHENYLIMIDAZO[4,5-B]PYRIDINE USING CAPILLARY LIQUID-CHROMATOGRAPHY ELECTROSPRAY-IONIZATION TANDEM MASS-SPECTROMETRY, Chemical research in toxicology, 8(8), 1995, pp. 1005-1013
On-line reversed-phase capillary liquid chromatography/tandem mass spe
ctrometry with electrospray ionization was used for the detection of 2
-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) adducts of DNA a
nd compared to analysis by P-32-postlabeling. Structural information w
as obtained on low nanogram levels of a synthetic N-(deoxyguanosin-8-y
l)-PhIP (dG-C8-PhIP) standard using collision-induced dissociation, an
d low picogram level detection was achieved for the targeted dG-C8-PhI
P adduct using the selective multiple reaction monitoring scanning mod
e. The method was applied to the analysis of an in vitro reaction mixt
ure identifying the dG-C8-PhIP adduct and providing evidence for the p
resence of two additional PhIP-modified deoxyguanosine adducts. The re
sults were in qualitative agreement with those obtained by the P-32-po
stlabeling method. In addition, the mass spectrometric results reveale
d the occurrence of an unexpected product in the in vitro reaction mix
ture presumably resulting from cleavage through the guanine base.