Determination of constituents of Telazol®-tiletamine and zolazepam by a gas chromatography/mass spectrometry-based method

Atul Kumar, Henry J. Mann, Rory P. Remmel

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Tiletamine and zolazepam injection (Telazol®) is used in veterinary surgical practice to induce short-term anesthesia and also to immobilize wild animals. The present work describes a sensitive method to measure tiletamine and zolazepam concentrations in plasma by means of GC/EI-MS on a 5% phenyl/95% methylpolysiloxane column. A simple liquid extraction procedure with ethyl acetate was used to isolate the two compounds and the same were separated and analyzed by GC/MS without derivatization. A formal validation of the assay demonstrated good accuracy and precision for both tiletamine (98-100.8%; < 6.7%) and zolazepam (98.3-103.4; < 13.2%). With 500 μl of plasma, the limits of quantification for both tiletamine and zolazepam were found to be 10 ng/ml. Both compounds were stable after three freeze-thaw cycles. The assay was used to analyze plasma samples collected from a pig after intramuscular administration of 10 mg/kg of Telazol®. The plasma concentration-time profile of tiletamine and zolazepam from this representative pig is also provided.

Original languageEnglish (US)
Pages (from-to)131-135
Number of pages5
JournalJournal of Chromatography B: Analytical Technologies in the Biomedical and Life Sciences
Issue number2 SPEC. ISS.
StatePublished - Oct 2 2006


  • GC/MS
  • Pharmacokinetics
  • Pig
  • Tiletamine
  • Zolazepam

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