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A New High-Performance Liquid Chromatographic Method for Fludarabine and Fludarabine Phosphate Compounded in Liposomes

Author(s):  Abang Anthony M, Abbas S Ali, Pham Trinh, Lambros Maria Polikandritou

Issue:  Jul/Aug 2001 - Sterile Product Compounding
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Abstract:  A simple and reproducible high-pressure liquid chromatography (HPLC) method was developed to measure simultaneously the concentrations of both fludarabine and liposome-compounded fludarabine in plasma. In this method, hypoxanthine 9-ß-D arabinofuranoside was used as an internal standard. Fludarabine, fludarabine phosphate, and hypoxanthine 9-ß-D arabinofuranoside were extracted from plasma and were separated by means of isocratic elution from a C18 reversed-phase column. The mobile phase consisted of 5% (v/v) methanol in 10 mM ammonium phosphate solution. The pH of the mobile phase was adjusted to 2.2 with 85% phosphoric acid. The detection wavelength was 260 nm, and the retention times for fludarabine, fludarabine phosphate, and hypoxanthine 9-ß-D arabinofuranoside were 48, 27, and 12 minutes, respectively. The recovery efficiencies varied depending on the amount spiked; however, they were 89% and 58% for 10 µg/mL of fludarabine and fludarabine phosphate, respectively. The limits of quantification for fludarabine and fludarabine phosphate were 0.03 µg/mL and 0.5 µg/mL, respectively. The assay was reproducible, and the within-day coefficients of variation (n = 4) were less than 6.9% and less than 8.7% for fludarabine and fludarabine phosphate, respectively. The between-day variabilities (n = 4) were less than 6.3% and less than 6.4% for fludarabine and fludarabine phosphate, respectively. The assays were linear within the range of 0.025 to 10 µg/mL (r2 = 0.999) for fludarabine and 0.5 to 10 µg/mL (r2=0.999) for fludarabine phosphate.

Related Keywords: Fludarabine, in liposomes, Fludarabine phosphate, in liposomes

Related Categories: CANCER AND AIDS, PEER-REVIEWED

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