Disposable pipette extraction for the simultaneous determination of biperiden and three antipsychotic drugs in human urine by GC-nitrogen phosphorus detection.

Background: Disposable pipette extraction with reversed-phase sorbent is proposed for the fast and simple GC determination of the antipsychotic drugs chlorpromazine, olanzapine, clozapine and biperiden - an anticholinergic drug - in human urine. The method was validated and successfully applied to postmortem urine samples. The analytical run was 11 min and lidocaine was used as the internal standard.
Results: The developed method showed good linearity, over the range of 0.34 to 5 ng/µl, for all compounds. The within-day and between-day precision and accuracy assays revealed values ≤15%, while the recoveries ranged from 85 to 120%. LOD and LOQ ranged from 0.28 to 0.42 ng/µl and from 0.85 to 3.58 ng/µl, respectively.
Conclusion: The developed method is a user-friendly technique, which is simple and fast.