title: [Absorption and pharmacokinetics of radix rehmanniae in rats].
abstract: In this paper, absorption and pharmacokinetic study of Radix Rehmanniae was studied by liquid chromatography coupled with mass spectrometry method after oral administration to rats. By comparing the chromatograms of ultraviolet, full scan, extracted ion and selective reaction monitoring (SRM) of standard solution, Radix Rehmanniae, blank plasma and rat plasma post drug administration, catalpol and ajugol were found to be the main compounds absorbed from Radix Rehmanniae. Plasma concentrations of aucubin, dihydrocatalpol, rehmannioside A (or rehmannioside B/ melittoside) and rehmannioside D were very low. Quantitative method for catalpol and aucubin and semi-quantitative method for other compounds in rat plasma were established. The pharmacokinetic study of those absorbed components was conducted after oral administration of 6 g x kg(-1) Radix Rehmanniae water extract to rats. Cmax, t(1/2) and AUC(0-infinity) of catalpol and ajugol were (2349.05 +/- 1438.34) and (104.25 +/- 82.05) ng x mL(-1), (0.86 +/- 0.32) and (0.96 +/- 0.37) h, (4407.58 +/- 2734.89) and (226.66 +/- 188.38) ng x h x mL(-1), respectively. tmax was at 1.00 h for catalpol and ajugol. Both catalpol and ajugol were absorbed and excreted rapidly.
authors.affiliation: School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Zhong
authors.affiliation: School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China.
authors.forename: Zhao-dan
authors.initials: ZD
authors.lastname: Tan
authors.affiliation: School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China.
authors.forename: Tian-ming
authors.initials: TM
authors.lastname: Wang
authors.affiliation: School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China.
authors.forename: Rong
authors.initials: R
authors.lastname: Shi
authors.affiliation: School of Pharmacy, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China.
authors.forename: Yue-ming
authors.initials: YM
authors.lastname: Ma
mesh_terms: D000284:Administration, Oral; D000818:Animals; D019540:Area Under Curve; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000493:pharmacokinetics*; D005260:Female; D057888:Iridoid Glucosides / Q000097:blood / Q000737:chemistry / Q000493:pharmacokinetics*; D057889:Iridoid Glycosides / Q000097:blood / Q000737:chemistry / Q000493:pharmacokinetics*; D008297:Male; D015394:Molecular Structure; D018517:Plant Roots / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry; D011714:Pyrans / Q000097:blood / Q000737:chemistry / Q000493:pharmacokinetics*; D051381:Rats; D017207:Rats, Sprague-Dawley; D032267:Rehmannia / Q000737:chemistry*
chemical_list: D004365:Drugs, Chinese Herbal; D057888:Iridoid Glucosides; D057889:Iridoid Glycosides; D011714:Pyrans; C078040:catalpol; C033250:harpagide