Validation of a method for the determination of the anticancer agent Combretastatin A1 phosphate (CA1P, OXi4503) in human plasma by HPLC with post-column photolysis and fluorescence detection.

Journal article

A validated method for the determination of Combretastatin A1 phosphate (CA1P, OXi4503), a bisphosphate prodrug of the vascular disrupting agent Combretastatin A1 in human plasma has been developed using fluorescence detection after post-column photolysis. The separation used the ion-pairing agent tetrabutylammonium hydrogen sulphate, and this agent was also required to give consistently high recovery from plasma. Initially, the range was shown to be linear (r(2)>0.995) from the LOQ of 0.025 μM to 5 μM, but as the trial progressed to much higher doses, using a lower injection volume, the assay was subsequently subject to limited revalidation to cover the range from 0.05 to 50 μM. Intra-assay precision and accuracy ranged from 2.2 to 11.8% and 1.8 to 13% respectively, and for inter-assay from 4.4 to 14.9% and 1.7 to 6.5%. Mean recovery of OXi4503 from plasma was 80.2%.

Authors: Stratford, MR; Folkes, L

• Publication status: Published
• Journal: Journal of chromatography. B, Analytical technologies in the biomedical and life sciences
• Volume: 879
• Issue: 25
• Pages: 2673-2676
• Publication date: 2011-09-01
• DOI: 10.1016/j.jchromb.2011.07.014
• EISSN: 1873-376X
• ISSN: 1570-0232
• Language: English
• Keywords: Animals; Mice; Spectrometry, Fluorescence; Diphosphates; Stilbenes; Humans; Linear Models; Sensitivity and Specificity; Reproducibility of Results; Antineoplastic Agents; Chromatography, High Pressure Liquid