Simultaneous determination of sulfur metabolites in Arabidopsis thaliana via LC-ESI-MS/MS and 34S-metabolic labeling

University of Taipei > 理學院 > 應用物理暨化學學系暨碩士班 > 期刊論文 > Item 987654321/4726

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题名:	Simultaneous determination of sulfur metabolites in Arabidopsis thaliana via LC-ESI-MS/MS and 34S-metabolic labeling
作者:	Chin-Lin Hsieh Kai-Wun Yeh Luit J. De Kok Ryh-Nan Pan Yueh-Hsiung Kuo Mei-Hwei Tseng 曾梅慧
贡献者:	臺北市立教育大學應用物理暨化學系
日期:	2011-08
上传时间:	2011-12-01 11:03:52 (UTC+8)
摘要:	Introduction – Sulphur-containing metabolites play an important role in metabolism and homeostasis. Determination of these metabolites is challenging owing to their low concentrations and the interference in mass spectrometry analysis. Objective – To develop a sensitive and accurate method based on liquid chromatography, electrospray ionisation, tandem mass spectrometry (LC-ESI-MS/MS) and 34S-metabolic labelling for quantification of methionine, reduced glutathione, oxidised glutathione in Arabidopsis thaliana. Methodology – A hydroponic set-up was used for the in vivo 34S-metabolic labelling of A. thaliana. The 34S-labelled metabolites biosynthesised in plant were extracted and used as internal standards. Tissue was extracted with perchloric acid (PCA) or PCA containing a known amount of the analytes for recovery analysis. Tissue extract mixed with extract of 34S-labelled A. thaliana in an appropriate ratio was subjected to a LC system and electrospray ionisation-mass spectrometric (ESI-MS) analysis. Quantification of metabolites was measured by comparing the 32S/34S ratios obtained for samples with the calibration curves. Results – Calibration curves showed linearity with regression coefficients in the range of 0.9994–0.9999. Analyte recoveries were approximately 100%. The coefficients of variation of intra-assay and inter-assay were less than 4.2% and 5%, respectively. The ranges for the limits of detection determined for Met, GSSG and GSH were 10 fmol, <10 fmol and 1.12 fmol and the limits of quantification determined for Met, GSSG and GSH were 0.44 pmol, 0.16 pmol and 34 fmol, respectively. Conclusion – The validated method for determination of methionine, reduced glutathione and oxidised glutathione was effectively applied to measure metabolite dynamics of sulphur-containing metabolites at the whole-plant level.
關聯:	Phytochemical Analysis
显示于类别:	[應用物理暨化學學系暨碩士班] 期刊論文

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