Rapid determination of methadone in plasma, cerebrospinal fluid, and urine by gas chromatography and its application to routine drug monitoring.

Abstract:

:Determination of methadone (MET) in biological fluids can serve to adjust dosages in patients suffering from cancer pain or participating in methadone maintenance programs. We developed a gas chromatographic assay using nitrogen-phosphorus detection. The method involves a single-step extraction from alkalized plasma, cerebrospinal fluid, or urine into n-hexane/isoamyl-alcohol (99/1, v/v). Dextropropoxyphene was used as internal standard. Separation was achieved with a silica SE-52-CB column (13 m x 0.25-mm I.D.). The method was validated for the determination of MET in plasma, urine, and cerebrospinal fluid with a quantification limit of 0.5 ng/mL. The coefficients of variation for within-day and between-day precision were within 10.2 and 14.1%, respectively. Approximately 100 samples can be analyzed by one person in the course of a working day, making the method applicable to routine drug monitoring. The method was demonstrated to be sensitive and accurate for pharmacokinetic studies in plasma, urine, or cerebrospinal fluid.

journal_name

Pharm Res

journal_title

Pharmaceutical research

authors

Schmidt N,Sittl R,Brune K,Geisslinger G

doi

10.1023/a:1018904825958

subject

Has Abstract

pub_date

1993-03-01 00:00:00

pages

441-4

issue

3

eissn

0724-8741

issn

1573-904X

journal_volume

10

pub_type

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