title: Absorption and urinary excretion of quercetin, rutin, and alphaG-rutin, a water soluble flavonoid, in rats.
abstract: Quercetin, rutin, alphaG-rutin (a water soluble flavonoid), and a mixture of rutin and alphaG-rutin were administered to rats by a single gastric intubation, and their absorption and urinary excretion were examined. The plasma and 24 h urinary levels of aglycons (quercetin and tamarixetin/isorhamnetin) were measured by HPLC after deconjugation with beta-glucuronidase/sulfatase treatment. alphaG-rutin was absorbed more rapidly than quercetin or rutin, and the plasma concentrations of quercetin and tamarixetin/isorhamnetin reached the highest peak level 30 min after dosing. Quercetin, rutin, and the mixture of rutin and alphaG-rutin showed the first peak level 8 h, 8 h, and 30 min after dosing, respectively. The area under the concentration-time curve (AUC) for quercetin in rats administered alphaG-rutin was approximately 4.5- and 2-fold higher than those in rats administered quercetin and rutin, respectively, and was almost the same as that in rats administered a mixture of rutin and alphaG-rutin. The highest 24 h urinary excretion was observed in alphaG-rutin-administered rats. These results suggest that alphaG-rutin is absorbed more efficiently than either quercetin or rutin and that a high plasma concentration can be maintained by supplying rutin and alphaG-rutin in combination.
authors.affiliation: Institute for Environmental Sciences, Graduate School of Nutritional and Environmental Sciences, University of Shizuoka, Yada 52-1, Shizuoka 422-8526, Japan. shimoi@smail.u-shizuoka-ken.ac.jp
authors.forename: Kayoko
authors.initials: K
authors.lastname: Shimoi
authors.forename: Kazuma
authors.initials: K
authors.lastname: Yoshizumi
authors.forename: Taketoshi
authors.initials: T
authors.lastname: Kido
authors.forename: Yumiko
authors.initials: Y
authors.lastname: Usui
authors.forename: Takashi
authors.initials: T
authors.lastname: Yumoto
mesh_terms: D000284:Administration, Oral; D000818:Animals; D019540:Area Under Curve; D002851:Chromatography, High Pressure Liquid; D007408:Intestinal Absorption; D008297:Male; D009753:Nutritive Value; D011794:Quercetin / Q000097:blood / Q000493:pharmacokinetics* / Q000652:urine; D051381:Rats; D017207:Rats, Sprague-Dawley; D012431:Rutin / Q000031:analogs & derivatives* / Q000097:blood / Q000493:pharmacokinetics* / Q000652:urine; D012995:Solubility; D014312:Trisaccharides / Q000097:blood / Q000493:pharmacokinetics / Q000652:urine
chemical_list: D014312:Trisaccharides; C069037:4(G)-alpha-glucopyranosyl-rutin; D012431:Rutin; D011794:Quercetin