A sensitive, specific and accurate high performance liquid chromatography/ionspray-tandem mass spectrometry procedure (HPLC/MS/MS) has been developed to quantify cyclophosphamide in human urine from hospital personnel involved in drug preparation and administration of antineoplastic alkylating agents. This methodology, which includes liquid-liquid extraction with ethylacetate, requires no derivatization procedures, preventing cyclophosphamide (CP) from possible thermal and chemical decomposition reactions. We detected the excretion of this unmetabolized alkylating drug in 50% of all the study participants. The amount of CP ranged from 0.1 ng mL-1 to 1.9 ng mL-1 urine. This methodology was validated by the use of ifosfamide as internal standard. The assay was linear over the range 0 to 3.2 ng mL-1 urine, with a lower limit of quantification of 0.2 ng mL-1. The limit of detection was assessed at 0.05 ng mL-1 urine. This method is characterized by a coefficient of variation -1) was always more than 85%. The extraction efficiency of cyclophosphamide from urine samples was also studied at six different pH values (pH 4, 5, 6, 7, 8, 10). The maximum extraction efficiency was obtained when the pH of urine solutions was adjusted to 7.0.
|Number of pages||6|
|Journal||Rapid Communications in Mass Spectrometry|
|Publication status||Published - 1998|
ASJC Scopus subject areas
- Analytical Chemistry