Automated determination of clozapine and major metabolites in serum and urine.
Ther Drug Monit
; 19(4): 480-8, 1997 Aug.
Article
in En
| MEDLINE
| ID: mdl-9263393
ABSTRACT
Clozapine is an atypical neuroleptic that is increasingly used for the treatment of schizophrenia. An automated method was developed for the routine quantification of clozapine and its major metabolites, N-desmethylclozapine and clozapine N-oxide, in human serum and urine by column switching and online high-performance liquid chromatography with ultraviolet detection. The method included adsorption of clozapine and its metabolites on a cyanopropyl-coated clean-up column (10 microns; 10 mm x 4.0 mm ID), washing interfering serum constituents to waste by deionized water, and, after column switching, separation on C18 ODS Hypersil reversed-phase material (5 microns; 250 mm x 4.6 mm ID). The compounds of interest were separated and eluted in fewer than 20 minutes, using a mobile phase consisting of 37.5 acetonitril62.5 water, containing 0.4% (vol/vol) tetramethylethylenediamine and adjusted to pH 6.5 with concentrated acetic acid. Ultraviolet-detection was performed at 254 nm. The determinations exhibited linearity between detector signal and drug concentrations in a range from 5 ng/ml to 50 micrograms/ml. As little as 10 ng/ml of clozapine and 20 or 30 ng/ml of the metabolites was quantifiable. Interferences with other psychotropic drugs, serum, or urine constituents were negligible. The automated procedure enables the analysis of clozapine and metabolites in serum or urine in less than 1 hour.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Antipsychotic Agents
/
Chromatography, High Pressure Liquid
/
Clozapine
Type of study:
Diagnostic_studies
Limits:
Humans
Language:
En
Journal:
Ther Drug Monit
Year:
1997
Document type:
Article
Affiliation country:
Alemania