巻号一覧
37 巻 (1989)
- 6 号 p. 313-
- 5 号 p. 281-
- 4 号 p. 229-
- 3 号 p. 141-
- 2 号 p. 97-
- 1 号 p. 33-
37 巻, 4 号
選択された号の論文の3件中1～3を表示しています
- |<
- <
- 1
- >
- >|
報文
-
Tamae Yanagisawa, Seiji Tobita, Susumu Tajima, Masaaki Yoshifuji, Naok ...1989 年 37 巻 4 号 p. 229-238
発行日: 1989年
公開日: 2007/05/01
ジャーナル フリーThe fragmentation processes of 1, 2-diethoxyethane have been investigated by using deuterium labelling experiments, mass analyzed ion kinetic energy spectroscopy, and measurements of kinetic energy release and heats of formation.
This molecular ion fragments to the ions at m/z 74, m/z 72, and m/z 59 by losses of C2H4O, C2H6O, and C3H7O, respectively, The first two reactions involve the hydrogen migration, These fragmentation mechanisms are estimated by comparison of the experimental results of the title compound with those of reference compounds.抄録全体を表示PDF形式でダウンロード (554K) -
Mitsuo Takayama, Toshio Fukai, Taro Nomura, Kazutetsu Nojima1989 年 37 巻 4 号 p. 239-247
発行日: 1989年
公開日: 2007/05/01
ジャーナル フリーIt was directly proved that the molecular ion M+ produced under FAB condition results in an EI-like fragmentation, and the protonated molecule (M+H)+ a CI-like fragmentation, by using a four-sector tandem mass spectrometer. The result was confirmed by comparing the B2/E2 linked scan FAB (B2/E2 tandem FAB) mass spectra of three prenylated flavonoids with the corresponding B/E linked scan EI (B/E-EI) and B/E-CI mass spectra.抄録全体を表示PDF形式でダウンロード (365K) -
Ryohei Yamaoka, Nobuko Shibayama, Takeshi Yamada, Masanori Sato1989 年 37 巻 4 号 p. 249-253
発行日: 1989年
公開日: 2007/05/01
ジャーナル フリーThe red dyes of woven fabrics (I, II and III) from the Greco-Roman period, excavated at Akoris in middle Egypt, were investigated using UV-VIS absorption spectroscopy, HPLC and thermospray type liquid chromatography/mass spectrometry, selected ion monitoring (SIM) technique. UV-VIS spectrum and HPLC retention time of dyes of II and III suggested the presence of alizarin (MW 240), a natural dye from madder. Further analysis was made by LC/MS SIM using m/z 241 (MH+ ion of alizarin) as the selected ion. The presence of an ion m/z 241 peak at the identical retention time for authentic alizarin strongly suggests that fabrics II and III were dyed by madder. Fabric I, however, was not dyed by this herb, but by an unidentified weakly polar pigment.抄録全体を表示PDF形式でダウンロード (218K)
- |<
- <
- 1
- >
- >|