title: Simultaneous determination of nucleosides and nucleotides in dietary foods and beverages using ion-pairing liquid chromatography-electrospray ionization-mass spectrometry.
abstract: A method using ion-pairing liquid chromatography-electrospray ionization (ESI)-mass spectrometry (MS) was developed for the simultaneous determination of 23 types of purine or pyrimidine nucleosides and nucleotides in dietary foods and beverages. Dihexylammonium acetate (DHAA) was used as an ion-pairing agent and an ultra performance liquid chromatography (UPLC) system with a reversed-phase column and a gradient program was employed for the separation of nucleosides and nucleotides. Positive-ion ESI-MS was applied for the detection of nucleosides, and negative-ion ESI-MS was used for nucleotides. Lower limits of quantitation ranged from 0.02 micromol/L (UMP and AMP) to 1.3 micromol/L (CDP). The present method was validated, and sufficient reproducibility and accuracy was obtained for the quantitative measurement of the 23 types of nucleosides and nucleotides. The method was subsequently applied to their determination in a range of Japanese foods and beverages that are considered to contain significant amounts of umami flavor compounds. Because dietary purine nucleosides and nucleotides are known to be related to hyperuricemia and gout, the determination of their concentrations in dietary foods is useful for both evaluating umami flavor and assessing the effects of dietary food on purine metabolism.
authors.affiliation: Department of Analytical Chemistry, School of Pharmaceutical Sciences, Teikyo University, 1091-1 Suwarashi, Midori-ku, Sagamihara, Kanagawa 229-0195, Japan.
authors.forename: Noriko
authors.initials: N
authors.lastname: Yamaoka
authors.forename: Yuko
authors.initials: Y
authors.lastname: Kudo
authors.forename: Katsunori
authors.initials: K
authors.lastname: Inazawa
authors.forename: Satoko
authors.initials: S
authors.lastname: Inagawa
authors.forename: Makoto
authors.initials: M
authors.lastname: Yasuda
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Mawatari
authors.forename: Kazuya
authors.initials: K
authors.lastname: Nakagomi
authors.forename: Kiyoko
authors.initials: K
authors.lastname: Kaneko
mesh_terms: D001628:Beverages / Q000032:analysis*; D002853:Chromatography, Liquid; D004032:Diet; D005504:Food Analysis / Q000379:methods*; D007477:Ions; D009705:Nucleosides / Q000032:analysis*; D009711:Nucleotides / Q000032:analysis*; D012015:Reference Standards; D015203:Reproducibility of Results; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D013997:Time Factors
chemical_list: D007477:Ions; D009705:Nucleosides; D009711:Nucleotides