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Micro-solid phase extraction and LC-MS 3 for the determination of triptorelin in rat plasma and application to a pharmacokinetic study.

Triptorelin is a synthetic decapeptide used for the treatment of prostate cancer. Attempts to determine triptorelin in clinical use by liquid chromatography-tandem mass spectrometry with multiple reaction monitoring have encountered problems due to its low concentration in plasma (pg/mL) and interference from endogenous peptides. We have overcome these issues using micro-solid phase extraction (μ-SPE) on Oasis® HLB 96-well μElution plates followed by LC-MS3 . Sample preparation by μ-SPE achieved sample concentration without the need for evaporation and reconstitution steps. Detection by LC-MS3 showed no significant matrix interference at the retention time of analyte and achieved high sensitivity (lower limit of quantitation 10 pg/mL) and good linearity in the range 10-3000 pg/mL. The method was successfully applied to a pharmacokinetic study in rat involving a single intramuscular injection of a formulation of triptorelin acetate biodegradable microspheres.

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