Sensitive assay for determining plasma tenofovir concentrations by LC/MS/MS

Tom Delahunty, Lane Bushman, Courtney V. Fletcher

Research output: Contribution to journalArticlepeer-review

94 Scopus citations


An LC/MS/MS assay for the determination of tenofovir (TNF) was developed and validated for use with the EDTA anticoagulated human plasma matrix. Heparin-treated plasma and serum matrices were also validated. After addition of adefovir as an internal standard, trifluoroacetic acid was used to produce a protein-free extract. Chromatographic separation was achieved with a Polar-RP Synergi, 2.0 mm x 150 mm, reversed-phase analytical column. The mobile phase was 3% acetonitrile/1% acetic acid, aq. Detection of TNF and the internal standard was achieved by ESI MS/MS in the positive ion mode using 288/176 and 274/162 transitions, respectively. The method was linear from 10 to 750 ng/ml with a minimum quantifiable limit of 10 ng/ml when 250 μl aliquots were analyzed. The usefulness of this LC/MS/MS method to routinely monitor plasma concentrations of TNF was demonstrated along with its ability to assist in the performance of pharmacokinetic studies.

Original languageEnglish (US)
Pages (from-to)6-12
Number of pages7
JournalJournal of Chromatography B: Analytical Technologies in the Biomedical and Life Sciences
Issue number1
StatePublished - Jan 2 2006
Externally publishedYes


  • Adefovir (PMEA)
  • LC/MS/MS
  • Plasma
  • Tenofovir (TNF)

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Clinical Biochemistry
  • Cell Biology

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