Article

Quantitative Analysis of Buprenorphine and Norbuprenorphine in Urine using Liquid Chromatography Tandem Mass Spectrometry

Department of Clinical Biochemistry, Leeds Teaching Hospitals NHS Trust, Britannia House, Britannia Road, Morley, Leeds, LS27 0DQ, U.K.
Journal of analytical toxicology (Impact Factor: 2.86). 06/2006; 30(4):238-44. DOI: 10.1093/jat/30.4.238
Source: PubMed

ABSTRACT

Buprenorphine is an opioid analgesic drug that is used as an alternative to methadone to treat heroin addiction. Established
methods for the analysis of buprenorphine and its metabolites in urine such as gas chromatography-mass spectrometry (GC-MS)
involve complicated sample extraction procedures. The aim of the present study was to develop a sensitive yet straightforward
method for the simultaneous analysis of buprenorphine and norbuprenorphine in urine using liquid chromatography-MS-MS. The
method comprised an enzymatic hydrolysis using Patella vulgata β-glucuronidase, followed by centrifugation and direct analysis of the supernatant. The limits of detection and quantitation
were < 1 µg/L for buprenorphine and < 1 and 4 µg/L, respectively, for norbuprenorphine. Assay coefficients of variation (CVs)
were < 15%, with the exception of concentrations close to the limit of quantitation, where CVs were below 20%. In direct comparison
with an established GC-MS protocol, the method showed minimal negative bias (8.7% for buprenorphine and 1.8% for norbuprenorphine)
and was less susceptible to sample carryover. The extent of conjugation in unhydrolyzed urine was investigated and found to
be highly variable, with proportions of unconjugated buprenorphine and norbuprenorphine of 6.4% [range 0% to 67%; standard
deviation (SD) 9.7%] and 34% (range 0% to 100%; SD 23.8%), respectively.

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