Stable Carbon Isotope Measurement of Individual Fatty Acids Using Gas Chromatography/Isotope Ratio Monitoring Mass Spectrometry

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概要

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• A gas chromatography/isotope ratio monitoring mass spectrometry (GC/IRMS) method was established for the determination of stable carbon isotopic compositions of individual saturated n-fatty acids ranging from C16 to C30. The fatty acids were derivatized to their methyl esters using BF3/methanol, and three n-alkanes were used as internal isotopic standard. Isotopic mass balance calculation indicated that the esterification caused no isotopic fractionation between the methyl ester moiety of fatty acid and methanol used. Therefore, isotopic correction was made by one additional carbon atom with the δ13C value of methanol. Analytical accuracy (deviation of the corrected δ13C values determined by GC/IRMS from those determined by a conventional method) and precision (standard deviation) were satisfactory for 90 to 360 ng of individual standard fatty acids examined. The accuracy was ±0.3‰ for average of several analyses, and the precision within 0.3‰. This method was applied to the δ13C determination of n-fatty acids ranging from C20 to C30 in a marine sediment.

• 日本質量分析学会の論文

著者

• NARAOKA Hiroshi

  Department of Earth Sciences, Okayama University

• ISHIWATARI Ryoshi

  Department of Chemistry, Tokyo Metropolitan University

• Ishiwatari R

  Tokyo Metropolitan Univ. Tokyo Jpn

• Ishiwatari Ryoshi

  Department Of Chemistry Graduate School Of Sciences Tokyo Metropolitan University

• Ishiwatari Ryoshi

  Department Of Chemistry School Of Science Graduate School Of Tokyo Metropolitan University

• Ishiwatari Ryoshi

  Department Of Chemistry Faculty Of Science Tokyo Metropolitan University

• YAMADA Keita

  Department of Chemistry, School of Science, Graduate School of Tokyo Metropolitan University

• Naraoka H

  Tokyo Metropolitan Univ. Tokyo Jpn

• Yamada Keita

  Department Of Chemistry Graduate School Of Sciences Tokyo Metropolitan University

• Naraoka Hiroshi

  Department Of Chemistry Graduate School Of Science Tokyo Metropolitan University

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