title: Oral bioavailability of curcumin in rat and the herbal analysis from Curcuma longa by LC-MS/MS.
abstract: This study presents a validated liquid chromatography technique coupled with tandem mass spectrometry (LC-MS/MS) to measure curcumin in rat plasma and provide curcuminoids analysis from the extract of Curcumin longa L. This method was applied to investigate the pharmacokinetics of curcumin in a freely moving rat. The analytes were separated by a reversed phase C18 column (150x4.6 mm I.D., particle size 5 microm) and eluted with acetonitrile-1mM HCOOH mobile phase (70:30, v/v) with a flow rate of 0.8 ml/min in rat plasma and herbal extracts. Multiple reaction monitoring (MRM) was used to monitor the transition of the deprotonated molecule m/z of 367 [M-H]- to the product ion 217 for curcumin, a m/z of 337-217 for demethoxycurcumin and a m/z of 265-224 for honokiol (internal standard) analysis. The limit of detection (LOD) and quantification (LOQ) of curcumin in the rat plasma were 1 and 5 ng/ml, respectively. The method was linear in the range of 5-1000 ng/ml with a coefficient of correlation greater than 0.996 in the rat plasma. After curcumin (500 mg/kg, p.o.) administration, the maximum concentration (Cmax) and the time to reach maximum concentration (Tmax) were 0.06+/-0.01 microg/ml and 41.7+/-5.4 min, respectively. The elimination half-life (t1/2,beta) were 28.1+/-5.6 and 44.5+/-7.5 min for curcumin (500 mg/kg, p.o.) and curcumin (10 mg/kg, i.v.), respectively. The oral bioavailability was about 1%.
authors.affiliation: Institute of Traditional Medicine, National Yang-Ming University, and Ho-Ping Branch, Taipei City Hospital, Taiwan.
authors.forename: Kuo-Yi
authors.initials: KY
authors.lastname: Yang
authors.forename: Lei-Chwen
authors.initials: LC
authors.lastname: Lin
authors.forename: Ting-Yu
authors.initials: TY
authors.lastname: Tseng
authors.forename: Shau-Chun
authors.initials: SC
authors.lastname: Wang
authors.forename: Tung-Hu
authors.initials: TH
authors.lastname: Tsai
mesh_terms: D000284:Administration, Oral; D000818:Animals; D001682:Biological Availability; D002853:Chromatography, Liquid / Q000379:methods*; D030024:Curcuma / Q000737:chemistry*; D003474:Curcumin / Q000008:administration & dosage / Q000032:analysis* / Q000493:pharmacokinetics; D015394:Molecular Structure; D010936:Plant Extracts / Q000008:administration & dosage / Q000032:analysis / Q000493:pharmacokinetics; D051381:Rats; D015203:Reproducibility of Results; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D010936:Plant Extracts; D003474:Curcumin