TABLE 1

Abundance of dmDNA31 and its metabolites in urine and bile after a single intravenous administration of unconjugated [14C]dmDNA31 in rats

AnalytesProtonated Molecular FormulaTheoretical m/z for [M+H]+Measured m/z for [M+H]+aMass Accuracy (ppm)Percentage of ID in BilePercentage of ID in Urine
dmDNA31C4914CH63N4O13+929.4419929.44432.5825.48.65
M1bC614CH17N2+131.1419131.14286.861.059.10
UnknownbNANANANA
M2C5914CH78N7O19S+1234.51001234.51181.464.521.49
M3cC4914CH63N4O14+945.4368945.43973.0718.31.52
M4cC4714CH61N4O12+887.4313887.43322.14
M5cC4914CH63N4O14+945.4368945.43973.07
M6dC49H61N4O13+913.4230913.42572.961.57ND
C4814CH61N4O13+915.4262915.42933.39
  • ID, injected dose; NA, not applicable; ND, not detected.

  • a The m/z values reported for dmDNA31 and its metabolites were from the most abundant ion incorporating one 14C-.

  • b The radioactive peak at retention time 1.9 min (around the solvent dead volume) is presumably a mixture of M1 and an unknown resulted of the loss of 14C label on N-methyl group on dmDNA31.

  • c M3, M4, and M5 coeluted under the current LC-MS conditions; therefore, their abundances (percentage of ID) in urine and bile were combined.

  • d M6 was identified as the N-desmethyl-dmDNA31 metabolite, so it was observed at m/z 913.4257 and m/z 915.4293 at an approximately 1:1 ratio, resulting from the loss of either the 14C-labeled methyl or nonlabeled methyl, respectively.