Determination of ginsenoside Rg3 in human plasma and urine by high performance liquid chromatography-tandem mass spectrometry.

Here we report a method capable of quantifying ginsenoside Rg3 in human plasma and urine. The method was validated over linear range of 2.5–1000.0ngmL−1 for plasma and 2.0–20.0ngmL−1 for urine using ginsenoside Rg1 as I.S. Compounds were extracted with ethyl acetate and analyzed by HPLC/MS/MS (API-4000 system equipped with ESI− interface and a C18 column). The inter- and intra-day precision and accuracy of QC samples were ≤8.5% relative error and were ≤14.4% relative standard deviation for plasma; were ≤5.6% and ≤13.3% for urine. The Rg3 was stable after 24h at room temperature, 3 freeze/thaw cycles and 131 days at −30°C. This method has been applied to pharmacokinetic study of ginsenoside Rg3 in human.