title: Analysis of biosynthetic fluctuations of cultured Taxus seedlings using a metabolomic approach.
abstract: Fluctuations in the biosynthesis of taxoids in 1-5 year old cultured seedlings of Taxus chinensis var. mairei were investigated using LC-IT-TOF-MS and a metabolomics approach. In the total ion chromatogram (TIC) of the extracts, 16 prominent peaks were observed. Ten compounds were identified by comparison of retention times and MS/MS spectra with those of reference compounds. An additional 6 taxoids were isolated by preparative HPLC and identified by comparison of their spectroscopic data with those reported in the literature. It was clarified that the relative concentrations of taxoids with 4(20) double bonds are high at early stages of cultivation. On the other hand, relatively higher amounts of 5-acetoxy taxoids oxidized at the 4- and 10- positions and taxoids having 5(20)-oxetane rings were found at later stages of cultivation. This approach provides practical information on the biosynthetic flow of taxoids in cultured yew seedlings.
authors.affiliation: Department of Medicinal Resources, Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama 930-0194, Japan. ktanaka@inm.u-toyama.ac.jp
authors.forename: Ken
authors.initials: K
authors.lastname: Tanaka
authors.forename: Feng
authors.initials: F
authors.lastname: Li
authors.forename: Kouhei
authors.initials: K
authors.lastname: Morikawa
authors.forename: Takahiro
authors.initials: T
authors.lastname: Nobukawa
authors.forename: Shigetoshi
authors.initials: S
authors.lastname: Kadota
mesh_terms: D002853:Chromatography, Liquid; D055432:Metabolomics / Q000379:methods*; D015394:Molecular Structure; D010936:Plant Extracts / Q000737:chemistry*; D010946:Plants, Medicinal / Q000737:chemistry; D036226:Seedlings / Q000737:chemistry; D053719:Tandem Mass Spectrometry; D043823:Taxoids / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D020946:Taxus / Q000737:chemistry*; D014934:Wood / Q000737:chemistry
chemical_list: D010936:Plant Extracts; D043823:Taxoids