title: An isotope effect on the comparative quantification of flavonoids by means of methylation-based stable isotope dilution coupled with capillary liquid chromatography/mass spectrometry.
abstract: Ionization suppression is a serious problem in liquid chromatography/mass spectrometry-based metabolomics, and stable isotope dilution-based comparative quantification is one of the most important methods of overcoming this problem. Herein, the use of [(13)C]-methylation-based stable isotope dilution for comparative quantification of flavonoids is demonstrated. This is in contrast to the equivalent deuterium labeling methylation method, which has an adverse isotope effect on reverse phase chromatography.
authors.affiliation: Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan. fukusaki@bio.eng.osaka-u.ac.jp
authors.forename: Ei'ichiro
authors.initials: E
authors.lastname: Fukusaki
authors.forename: Kazuo
authors.initials: K
authors.lastname: Harada
authors.forename: Takeshi
authors.initials: T
authors.lastname: Bamba
authors.forename: Akio
authors.initials: A
authors.lastname: Kobayashi
mesh_terms: D016477:Artifacts; D002247:Carbon Isotopes / Q000032:analysis / Q000737:chemistry*; D002853:Chromatography, Liquid / Q000379:methods*; D005419:Flavonoids / Q000032:analysis* / Q000737:chemistry*; D013058:Mass Spectrometry / Q000379:methods*; D008745:Methylation
chemical_list: D002247:Carbon Isotopes; D005419:Flavonoids