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Pharmacokinetic Study of Hot-melt Spray-dried Andrographolide Granules

??OBJECTIVE To study the pharmacokinetics of hot-melt spray-dried andrographolide granules and compare it with andrographolide bulk drug. METHODS A liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was established for determination of the concentration of andrographolide in plasma of rats which were respectively given micronized andrographolide and hot-melt spray-dried andrographolide granules, then the pharmacokinetic parameters were calculated. RESULTS The pharmacokinetic parameters of andrographolide after a single dose administration of micronized andrographolide and hot-melt andrographolide were as following: t_1/2 were (347.33??9.32) and (390.82??8.78) min, t_max were (30.00??5.94) and (60.00??3.48) min, ??_max were (1 940.14??21.21) and (1 818.22??23.64) ng??mL^-1, AUC_0-t were (427 515.71??37 350.03) and (426 406.31??20 577.75) ng??min??mL^-1, AUC_0-inf were (545 423.14??47 969.18) and (593 569.87??30 247.35) ng??min??mL^-1, Vz/F were (43.48??4.75) and (44.96??3.81) kg??L^-1, CL/F were (86.78??3.35) and (79.74??2.89) kg??L^-1??min^-1, respectively. CONCLUSION Compared with the bulk drug, the hot-melt spray-dried andrographolide granules have a longer t_1/2, lower ??_max and delayed t_max in rats.