PMID- 14656600 OWN - NLM STAT- MEDLINE DCOM- 20040921 LR - 20191210 IS - 0731-7085 (Print) IS - 0731-7085 (Linking) VI - 33 IP - 5 DP - 2003 Dec 4 TI - HPLC-MS/MS determination of a peptide conjugate prodrug of doxorubicin, and its active metabolites, leucine-doxorubicin and doxorubicin, in dog and rat plasma. PG - 1093-102 AB - A HPLC-MS/MS Electrospray (ESI) method was developed and validated to quantify a peptide conjugate prodrug of doxorubicin (Dox-Con) and its active metabolites leucine-doxorubicin (Leu-Dox) and doxorubicin (Dox) in dog and rat plasma. The analytes were extracted from plasma by solid-phase extraction on a Bond Elut C8 cartridge and eluted with chloroform-methanol (2:1). Eluates were evaporated and reconstituted in acetonitrile-5 microM sodium trifluoroacetate in 0.1% aqueous formic acid (20:80) and injected onto a Waters Oasis HLB column. Analytes were eluted from the column with a solvent gradient into the mass analyzer. The ions were quantified in the selected reaction-monitoring mode (SRM), using positive ions, on a triple quadrupole mass spectrometer. The lower limits of quantification for Dox-Con, Leu-Dox, and Dox in plasma, were approximately 5, 1 (dog)/6 (rat), and 0.5 ng/ml, respectively. Intra- and inter-assay accuracy (% of nominal concentration) and precision (%CV) for all analytes were within 15 and 16%, respectively. FAU - Mazuel, Claude AU - Mazuel C AD - Laboratoires Merck-Sharp and Dohme-Chibret Route de Marsat--Riom, 63963 Clermont-Ferrand Cedex 9, France. claude_mazuel@merck.com FAU - Grove, Jeffrey AU - Grove J FAU - Gerin, Genevieve AU - Gerin G FAU - Keenan, Kevin P AU - Keenan KP LA - eng PT - Journal Article PT - Validation Study PL - England TA - J Pharm Biomed Anal JT - Journal of pharmaceutical and biomedical analysis JID - 8309336 RN - 0 (Peptides) RN - 0 (Prodrugs) RN - 80168379AG (Doxorubicin) RN - GMW67QNF9C (Leucine) SB - IM MH - Animals MH - Calibration MH - Chromatography, High Pressure Liquid/methods MH - Dogs MH - Doxorubicin/*blood/metabolism MH - Drug Stability MH - Female MH - Freezing MH - Leucine/*blood MH - Male MH - Peptides/*blood/metabolism MH - Prodrugs/analysis/*metabolism MH - Rats MH - Spectrometry, Mass, Electrospray Ionization/*methods EDAT- 2003/12/06 05:00 MHDA- 2004/09/24 05:00 CRDT- 2003/12/06 05:00 PHST- 2003/12/06 05:00 [pubmed] PHST- 2004/09/24 05:00 [medline] PHST- 2003/12/06 05:00 [entrez] AID - S0731708503004345 [pii] AID - 10.1016/s0731-7085(03)00434-5 [doi] PST - ppublish SO - J Pharm Biomed Anal. 2003 Dec 4;33(5):1093-102. doi: 10.1016/s0731-7085(03)00434-5.