Effect of Compatibility of Gardeniae Fructus and Rhododendri Mollis Flos on Pharmacokinetics of Rhodojaponin Ⅱ and Rhodojaponin Ⅲ in Rat Plasma
OBJECTIVE To investigate the effects of compatibility of Gardeniae Fructus and Rhododendri Mollis Flos on the pharmacokinetic behavior of rhodojaponin Ⅱ and rhodojaponin Ⅲ of Rhododendri Mollis Flos.METHODS LC-MS/MS of rhodojaponin Ⅱ and rhodojaponin Ⅲ in plasma of rats was developed.The method was then applied to study the blood concentrations of rhodojaponin Ⅱ and rhodojaponin Ⅲ in rats after oral compatibility administration of Gardeniae Fructus and Rhododendri Mollis Flos and single decoction administration of Rhododendri Mollis Flos,respectively,then their pharmacokinetic parameters were calculated and statistical analysed.RESULTS The calibration curve was good linearity(r>0.999)in the range of 1-200 ng·mL-1 for rhodojaponin Ⅱ and 1-100 ng·mL-1 for rhodojaponin Ⅲ,the precision of quality control samples was less than 12%and the accuracy was less than 20%.After administration of compatibility of Gardeniae Fructus and Rhododendri Mollis Flos and Rhododendri Mollis Flos alone,the AUC0-t of rhodojaponin Ⅱ in vivo was(260.44±51.67)and(213.39±59.03)h·ng·mL-1,respectively,and the AUC0-t of rhodojaponin Ⅲ was(60.97±22.78)and(22.38±5.55)h·ng·mL-1,respectively.Compared with single decoction of Rhododendri Mollis Flos administration group,the T1/2 and MRT(0-t)of the rhodojaponin Ⅱ were significantly increased,the AUC0-t,T1/2,Tmax and CL of the rhodojaponin Ⅲ were also significantly rised after administration of compatibility of Gardeniae Fructus and Rhododendri Mollis Flos.CONCLUSION After the compatibility of Gardeniae Fructus and Rhododendri Mollis Flos,the rate of absorption and the distribution volume are increased of rhodojaponin Ⅲ in rats,while the elimination rate has decreased,the T1/2 of rhodojaponin Ⅱ and rhodojaponin Ⅲ are extended,but don't affect the absorption rate of rhodojaponin Ⅱ in rats.