Quantification of CPT13 in rat plasma using LC-MS/MS for a pharmacokinetic study.

A new, simple, sensitive and specific reversed-phase high performance liquid chromatographic (HPLC) method using tandem mass spectrometry detection was initially developed and validated for the analysis of 10-(2-pyrazolyl-ethoxy)-(20S)-camptothecin (CPT13) in rat plasma. Pretreatment of the sample obtained from plasma involved a single protein precipitation step with using acetonitrile containing 0.1% formic acid.

Cytotoxicity and topo I targeting activity of substituted 10--nitrogenous heterocyclic aromatic group derivatives of SN-38.

A series of 10-position substituted nitrogenous heterocyclic aromatic group derivatives of SN-38 were prepared. Most of these compounds possessed lower cytotoxicities than CPT. Compound 13 revealed potent cytotoxicity similar to CPT, and compounds 17, 18, and 19 showed similar cytotoxic activity to topotecan.