High-performance liquid chromatographic determination of bromural in serum upon hemoperfusion

Simultaneous determination of bromvalerylurea and allylisopropylacetylurea in human blood and urine by gas chromatography-mass spectrometry

We devised a sensitive and simple method to simultaneously determine bromvalerylurea and allylisopropylacetylurea in human blood and urine by gas chromatography-mass spectrometry. Bromvalerylurea and allylisopropylacetylurea were extracted using an Extrelut column with an internal standard, 2-bromohexanoylurea, followed by derivatization with heptafluorobutyric anhydride. The derivatized extract was submitted to GC-MS analysis of EI-SIM mode. The calibration curves of both compounds were linear in the concentration range from 0.01 to 10 microg/ml in both blood and urine samples. The lower limits of detection of bromvalerylurea and allylisopropylacetylurea were 0.005 and 0.005 microg/ml, respectively. This method proved most useful in accurately identifying these drugs in blood and urine from an autopsied individual.

Application of high-performance liquid chromatography/mass spectrometry to drug screening

High-performance liquid chromatography/mass spectrometry enabled us not only to measure bromvalerylurea rapidly, < or = 2 h following accumulation of human bone marrow, but also to improve sensitivity without interference. The method can be widely and effectively used in the fields of pharmacy and forensic sciences.

Enantioselective determination of R- and S-(alpha-bromoisovaleryl)urea in plasma using high-performance liquid chromatography after solid-phase extraction

A stereoselective method has been developed for the determination of R- and S-(alpha-bromoisovaleryl)urea in plasma and saliva after oral administration. The chiral separation was carried out on Chiralcel OJ or OD columns with hexane--2-propanol as the mobile phase. The poor detection properties of the analyte required the development of an effective sample pretreatment procedure to enable ultraviolet detection at 210 nm. Solid-phase extraction using hydrophobic Amberlite XAD-2 in combination with washing steps at alkaline and acidic pH completely removed interfering components of the biological matrix and allowed the detection of the optical isomers at concentrations down to 10 ng/ml (0.05 microM). The method was validated by determining the recovery, linearity, accuracy and within-day and between-day repeatability at 50, 200 and 2000 ng/ml. Application to the analysis of plasma and saliva samples is demonstrated.