Column-switching solid-phase trace-enrichment high-performance liquid chromatographic method for measurement of buprenorphine and norbuprenorphine in human plasma and urine by electrochemical detection.
We describe a new high-performance liquid chromatographic method using electrochemical detection for the determination of buprenorphine and norbuprenorphine in plasma and urine. The minimum concentration for detection of buprenorphine and norbuprenorphine is 40 pg/ml. The intra-assay coefficient of variation (C.V.) in plasma and urine samples ranges from 6 to 17% depending on the drug concentration. At a plasma concentration of 500 pg/ml the inter-assay C.V. is 8% for buprenorphine and 9% for norbuprenorphine. The analysis duration is 16 min. After solid-phase extraction and evaporation a valve-switching system with two Rheodyne valves enables sample enrichment, optimal sample cleaning and rapid elution of long-retained substances.
Buprenorphine↗