Studies on triterpenes chemical constituents in rhizome of Alisma gramineum / 中国中药杂志

<p><b>OBJECTIVE</b>To investigate the triterpenoids chemical constituents in rhizome of Alisma gramineum.</p><p><b>METHOD</b>Silicon gel chromatography and HPLC techniques were employed for isolation and purification of the constituents, and the structures were elucidated by various spectral analyses such as NMR, MS and IR.</p><p><b>RESULT</b>5 protostane-type tetracyclic triterpenoids were isolated and identified as 16,23-oxidoalisol B(1), 11-deoxyalisol C(2), alisol F(3), 16beta-methoxyalisol B acetate (4), 16beta-hydroxyalisol B acetate (5).</p><p><b>CONCLUSION</b>All of these compounds were found from A. gramineum for the first time.</p>

The pharmacokinetics of rhein in 12 healthy volunteers after oral administration of rhubarb extract / 中国中药杂志

<p><b>OBJECTIVE</b>To study the pharmacokinetics of rhein in 12 healthy volunteers after oral administration of rhubarb extract.</p><p><b>METHOD</b>The blood sample were obtained at 0,0.083,0.5,1,1.5,2,3,4,5,7,10 h after a single dose oral administration of rhubarb (50 mg x kg(-1)). The plasma rhein concentration was determined by HPLC. The pharmacokinetics of rhein were analysed by 3P97 program.</p><p><b>RESULT</b>The absorption of rhein was very fastafter oral administration of rhubarb extract in the healthy volunteers. The main pharmacokinetic parameters of rhein were C(max) (3.20 +/- 1.08) microg x mL(-1); t(max) (1.03 +/- 0.41) h; t(1/2alpha) (0.21 +/- 0.02) h; t(1/2beta) (2.68 +/- 1.09) h; MRT(5.31 +/- 1.78) h; AUC(0-infinity) (1 573.08 +/- 366.48) microg x mL(-1) min(-1), respectively.</p><p><b>CONCLUSION</b>Rhein could be absorbed rapidly and its pharmacokinetics was consistent with two-compartment model.</p>