Clinical Chemistry
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Clinical Chemistry 24: 45-49, 1978;
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Clinical Chemistry, Vol 24, 45-49, Copyright © 1978 by American Association for Clinical Chemistry

Analysis for 1,3-bis(2-chloroethyl)-1-nitrosourea by chemical ionization mass spectrometry

RJ Weinkam, JH Wen, DE Furst and VA Levin

We used chemical ionization mass spectrometry to quantify the cancer chemotherapeutic agent 1,3-bis(2-chloroethyl)-1-nitrosourea in biological fluids. A stable isotope-labeled internal standard was added to the fluid being analyzed. Protonated molecular ion intensity ratios were determined by selected ion monitoring of sample extracts inserted directly into the chemical ionization source. Peak ratios were calculated for chlorine isotope ratios in their natural abundance, to verify the integrity of the data acquired, and to compute the drug concentration. The assay was applied to measure the compound in rat blood and plasma and in human plasma, and to monitor in vitro metabolism in rat-liver microsomal preparations. For the analyses we used a quadrupole mass spectrometer interfaced to a commercial computer system. Data-system characteristics are described.


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Home page
 Arch DermatolHome page
V. A. Levin, H. S. Zackheim, and J. Liu
Stability of Carmustine for Topical Application
Arch Dermatol, July 1, 1982; 118(7): 450 - 451.
[Abstract] [PDF]


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Copyright © 1978 by the American Association for Clinical Chemistry.