Abstract:
AIM OF THE STUDY:Rhei Rhizoma, the rhizome of Rheum palmatum L. (RP), is a popular herb in clinical Chinese medicine. RP is abundant in polyphenolic anthraquinones, which have been reported to show various beneficial bioactivities. This study investigated the pharmacokinetics and tissue distribution of anthraquinones following seven-dose administration of RP decoction to rats. MATERIALS AND METHODS:Six Sprague-Dawley rats were given 2.0 g/kg of RP twice daily for seven doses and blood samples were collected at designated time after the 7th dose. Another six rats were sacrificed at 30 min after the 7th dose and organs including liver, kidney, lung and brain were collected. Serum and tissue specimens were assayed by HPLC before and after hydrolysis with β-glucuronidase and sulfatase, respectively. RESULTS:Pharmacokinetic analysis indicated that the anthraquinones in serum mainly presented as glucuronides/sulfates and contained higher ratio of sulfates when compared with single-dose administration of RP. Contrary to the finding in serum, tissue analysis discovered mainly free form of anthraquinone in most organs assayed, such as aloe-emodin and rhein in kidney, liver, lung; emodin in liver, lung; trace of chrysophanol in kidney and liver. In all brains, neither free forms nor their glucuronides/sulfates have been detected. CONCLUSIONS:The glucuronides/sulfates of anthraquinones were the major forms in bloodstream, whereas the free forms of most anthraquinones were predominant in kidney and liver.
journal_name
J Ethnopharmacoljournal_title
Journal of ethnopharmacologyauthors
Shia CS,Tsai SY,Lin JC,Li ML,Ko MH,Chao PD,Huang YC,Hou YCdoi
10.1016/j.jep.2011.08.003subject
Has Abstractpub_date
2011-10-11 00:00:00pages
1388-94issue
3eissn
0378-8741issn
1872-7573pii
S0378-8741(11)00567-8journal_volume
137pub_type
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