title: Simultaneous determination of magnolin and epimagnolin A in rat plasma by liquid chromatography with tandem mass spectrometry: Application to pharmacokinetic study of a purified extract of the dried flower buds of Magnolia fargesii, NDC-052 in rats.
abstract: A purified extract isolated from the dried flower buds of Magnolia fargesii (NDC-052) is currently being evaluated for phase III clinical trials as a new anti-asthma drug. A rapid, sensitive and selective liquid chromatography-tandem mass spectrometric (LC/MS/MS) method for the simultaneous determination of magnolin and epimagnolin A, the major bioactive components of NDC-052, in rat plasma was developed. After liquid-liquid extraction with tolterodine as an internal standard, magnolin and epimagnolin A were separated on a Luna phenyl-hexyl column with the mobile phase of 70% methanol in 10mM ammonium formate. The analytes were detected by an electrospray ionization tandem mass spectrometry in the multiple-reaction-monitoring mode. The standard curves were linear over the concentration range of 50-2500ng/mL for magnolin and epimagnolin A in rat plasma. The intra- and inter-day coefficients of variation and relative errors for magnolin and epimagnolin A at four QC concentrations were 1.5-11.4% and 5.9-12.5%, respectively. The lower limits of quantification for magnolin and epimagnolin A were 50.0ng/mL using 50microL of plasma. This method was successfully applied to the pharmacokinetic study of magnolin and epimagnolin A after an oral administration of NDC-052 in male Sprague-Dawley rats.
authors.affiliation: Wonkwang University, Iksan, Republic of Korea.
authors.forename: Nam Jin
authors.initials: NJ
authors.lastname: Kim
authors.forename: Sei-Ryang
authors.initials: SR
authors.lastname: Oh
authors.forename: Hyung Kyu
authors.initials: HK
authors.lastname: Lee
authors.forename: Hye Suk
authors.initials: HS
authors.lastname: Lee
mesh_terms: D000818:Animals; D002138:Calibration; D002853:Chromatography, Liquid / Q000379:methods*; D004365:Drugs, Chinese Herbal / Q000493:pharmacokinetics*; D017705:Lignans / Q000097:blood* / Q000493:pharmacokinetics; D031566:Magnolia / Q000737:chemistry*; D008297:Male; D010936:Plant Extracts / Q000097:blood* / Q000493:pharmacokinetics; D051381:Rats; D017207:Rats, Sprague-Dawley; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D004365:Drugs, Chinese Herbal; D017705:Lignans; C573332:NDC-052; D010936:Plant Extracts; C094148:magnolin