title: Determination of N-7-[2H3]methyl guanine in rat urine by gas chromatography-mass spectrometry following administration of trideuteromethylating agents or precursors.
abstract: A gas chromatographic-mass spectrometric method has been developed for the determination of N-7-[2H3]methyl guanine in urine in the presence of large natural levels of N-7-methyl guanine. Urine is fractionated on heptanesulfonic acid-treated C-18 Sep-pak cartridges, followed by derivatization to give a volatile N-heptafluorobutyryl-O6-2,3,4,5, 6-pentafluorobenzyl derivative which is separated on an SE52 fused silica capillary column. Using N-7-ethyl guanine as an internal standard, the total amount of N-7-methyl guanine is determined by gas chromatography-flame ionization detection. The percentage of N-7-[2H3]methyl guanine is then measured by gas chromatography-mass spectrometry, enabling the amount of deuterated base to be determined. Preliminary experiments with [2H3]methyl methanesulfonate in rats showed measurable excretion of N-7-[2H3]methyl guanine. 4-(Di[2H3]methylamino)antipyrine alone gave no detectable amount of alkylated base, but coadministration of nitrite resulted in excretion of deuterated N-7-methyl guanine.
mesh_terms: D000477:Alkylating Agents / Q000494:pharmacology*; D000818:Animals; D003903:Deuterium; D008401:Gas Chromatography-Mass Spectrometry; D006147:Guanine / Q000031:analogs & derivatives* / Q000652:urine; D007553:Isotope Labeling; D008745:Methylation; D051381:Rats
chemical_list: D000477:Alkylating Agents; D006147:Guanine; C008450:7-methylguanine; D003903:Deuterium