巻号一覧
42 巻 (1994)
- 6 号 p. 291-
- 5 号 p. 249-
- 4 号 p. 225-
- 3 号 p. 155-
- 2 号 p. 67-
- 1 号 p. 1-
42 巻, 6 号
選択された号の論文の3件中1～3を表示しています
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総説
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内藤 康秀, 井上 雅夫1994 年 42 巻 6 号 p. 291-313
発行日: 1994年
公開日: 2007/07/20
ジャーナル フリーFourier transform ion cyclotron resonance mass spectrometry (FT-ICR/MS) is one of the most successful examples of application of fast Fourier transform (FFT) technique to analytical methods. In this paper principle and features of FFT used in FT-ICR/MS are presented and various new techniques and recent development in signal processing and excitation of cyclotron motion of ions are introduced. The problem of non-linear effects in FT-ICR/MS is also discussed. They are caused by inhomogeneous electric and magnetic fields and ion-ion interaction.抄録全体を表示PDF形式でダウンロード (1508K)
報文
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Hiroshi NARAOKA, Keita YAMADA, Ryoshi ISHIWATARI1994 年 42 巻 6 号 p. 315-323
発行日: 1994年
公開日: 2007/07/20
ジャーナル フリー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.抄録全体を表示PDF形式でダウンロード (641K) -
Naoto SENDA, Hisamasa WAKAYAMA, Tomoyuki FUJITA, Tomomi BANDO, Kenichi ...1994 年 42 巻 6 号 p. 325-331
発行日: 1994年
公開日: 2007/07/20
ジャーナル フリーIt is known that several kinds of pyrrolidine alkaloids with a bis-amide structure are isolated from extracts from leaves and roots of Meliaceae family plants. A fragment ion m/z 85 was found in common in mass spectra of all these compounds. The structure and fragmentation mechanism of the ion were elucidated through high-resolution mass spectra and B/E as well as B2/E linked scan spectra. The fragment ion was also found useful as an index for searching compounds having similar structures.抄録全体を表示PDF形式でダウンロード (310K)
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