Development and validation of a sensitive solid-phase extraction and high-performance liquid chromatographic assay for the novel bio-reductive anti-tumor agent RH1 in human and mouse plasma.
A HPLC assay and solid-phase extraction technique from human plasma has been developed and validated for the experimental anticancer agent, RH1 (2,5-diaziridinyl-3-hydroxymethyl-6-methyl-1,4-benzoquinone) which is currently being evaluated by the CRC phase I/II committee. A 500 mg amino propyl solid-phase extraction cartridge was used to isolate RH1 from human plasma. Analysis was performed on a reversed-phase chromatography system using a 15 cm cyanopropyl column and isocratic elution with a 10% methanol-90% water (double distilled) solution. The lower limit of quantitation for RH1 was found to be 0.00375 microg/ml (3.75 ng/ml+/-8.3%) in water and following extraction from plasma. Recovery of >80%(+/-11.9%) was achieved over a five-day validation study. This method was used to carry out pre-clinical studies in BDF mice (standard strain of hybrid mice) at three dose levels (2, 5 and 10 mg/kg of RH1 in 0.9% (w/v) saline via an intraperotoneal injection). Standard Version of PC Winnonlin pharmacokinetic modelling software was used to model the data. A none-compartmental model was used to describe the disposition of RH1 in mice plasma. RH1 was rapidly eliminated from plasma with a mean plasma clearance of 23.4 ml/min, mean volume of distribution of 321.6 ml and mean t(1/2) alpha and beta decays of 4.8 and 9.6 min, respectively. RH1 in human and mouse whole blood and plasma was found to be stable up to 2 h.
Paterson Institute for Cancer Research, Section of Drug Development and Imaging, Christie Hospital NHS Trust, Withington, Manchester, UK. pkhan@picr.man.ac.uk
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Khan
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Abbas
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Hargreaves
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Caffrey
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Megram
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McGown
D000818:Animals; D000970:Antineoplastic Agents / Q000097:blood* / Q000493:pharmacokinetics; D001388:Aziridines / Q000097:blood* / Q000493:pharmacokinetics; D016227:Benzoquinones / Q000097:blood* / Q000493:pharmacokinetics; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006801:Humans; D051379:Mice; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
C117776:2,5-diaziridinyl-3-(hydroxymethyl)-6-methyl-1,4-benzoquinone; D000970:Antineoplastic Agents; D001388:Aziridines; D016227:Benzoquinones