Determination of N-7-[2H3]methyl guanine in rat urine by gas chromatography-mass spectrometry following administration of trideuteromethylating agents or precursors
✍ Scribed by David E.G. Shuker; Eric Bailey; Susan M. Gorf; John Lamb; Peter B. Farmer
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- English
- Weight
- 472 KB
- Volume
- 140
- Category
- Article
- ISSN
- 0003-2697
No coin nor oath required. For personal study only.
✦ Synopsis
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.