LAUSR

Introduction: Deltaline, an aconitine-type alkaloid, was detected in mouse blood using an ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) method, and the pharmacokinetics of deltaline following intravenous administration in mice was studied. Materials and Methods: The gelsenicine was used as the internal standard (IS). Deltaline and IS were eluted at a flow rate of 0.4 ml/min and separated on a UPLC BEH C18 column by gradient elution using acetonitrile and 10 mmol/L ammonium acetate (0.1% formic acid) as a mobile phase. The following transitions were obtained at m/z 508.2→75.0 for deltaline and m/z 327.1→107.8 for gelsenicine in multiple reactions monitoring mode. Acetonitrile was used to precipitate protein. Six mice after intravenous administration of a single dose of deltaline (1 mg/kg), 20-µL blood samples from each mouse were collected from the tail vein. The UPLC-MS/MS method was sensitive and linear (r>0.995) with a lower limit of quantitation (LLOQ) of 0.1 ng/mL over the range of 0.1-500 ng/mL. Intra- and inter-day precisions were below 13%, the accuracy range was between 88.0% and 108.2%, the recovery was higher than 90.1%, and the matrix effect was between 102.9% and 108.1%. The method was sensitive, fast, specific, and has been successfully applied to a pharmacokinetic study of deltaline after intravenous administration.