GAO Rui-na, ZHONG Da-fang, DENG Pan, CHEN Xiao-yan. Determination of Liposomal 10-Hydroxycamptothecin in Dog Plasma by LC-MS/MS[J]. Journal of Chinese Mass Spectrometry Society, 2009, 30(增刊): 86-88.
Citation: GAO Rui-na, ZHONG Da-fang, DENG Pan, CHEN Xiao-yan. Determination of Liposomal 10-Hydroxycamptothecin in Dog Plasma by LC-MS/MS[J]. Journal of Chinese Mass Spectrometry Society, 2009, 30(增刊): 86-88.

Determination of Liposomal 10-Hydroxycamptothecin in Dog Plasma by LC-MS/MS

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  • Received Date: December 31, 1899
  • Revised Date: December 31, 1899
  • 10-hydroxycamptothecin,camptothecin analogue,is an antitumor agent that targets the nuclear enzyme topoisomerase I. 10-hydroxycamptothecin is injected by sodium salt form in clinic, and myelosuppression is the major toxicity. To enhance water solubility and reduce the toxicity, lipid nanoparticle which is water-soluble was designed. The quantitative analyses of liposomal and total 10-hydroxycamptothecin in dog plasma were developed and validated by liquid chromatographic-tandem mass spectrometry(LC-MS/MS). Two preparation procedures were developed to separate liposomal 10-hydroxycamptothecin, one was solid phase extraction, the other was liquid-liquid extraction. The analyte and internal standand(camptothecin) were separated on a Zorbax SB-C18 column using the mobile phase consisting of V(acetonitrile):V(water):V(formic acid)=70:30:0.2. Electropray ionization source of MS was applied and operated in positive ion mode. The peak area of the m/z 365→321 transition of 10-hydroxycamptothecin and that of m/z 349→305 transition of the IS were measured. The linear calibration curve for liposmal 10-hydroxycamptothecin is obtained in the concentration range of 1.00- 1 000μg L-1, and that for total 10-hydroxycamptothecin is obtained in the concentration range of 1.00- 2 000μg L-1. The recoveries of solid phase extraction and liquid-liquid extraction methods are 48.1%-52.4% and 79.6%-83.0%, respectively. This validated LC-MS/MS assay is successfully applied to pharmacokinetic study of 10-hydroxycamptothecin loaded lipid nanoparticle in dogs after administration single dosages of 0.5, 1, 2 mg kg-1 and multiple dosage of 1.0 mg kg-1 d-1 10-hydroxycamptothecin lipid nanoparticle.
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