Kiyoko Suwa
Mukogawa Women's University
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Featured researches published by Kiyoko Suwa.
European Journal of Mass Spectrometry | 1999
Shizuyo Horiyama; Kiyoko Suwa; Masae Yamaki; Hiromi Kataoka; Toyashi Katagi; Mitsuo Takayama
A degradation phenomenon of O-acyl oximes under fast-atom bombardment (FAB) conditions is described from the point of view of reactivity with the liquid matrix and irradiation time with the xenon neutral beam. Mass spectra of O-acyl oximes were compared with those of the free oxime and hydroxylamine as model compounds, by using two different matrices, m-nitrobenzyl alcohol and DTT/TG12 (a 1:2 mixture of dithiothreitol and thioglycerol). A characteristic fragment ion was observed in the FAB mass spectra of O-acyl oximes and a free oxime only when DTT/TG12 was used. Collision-activated dissociation (CAD) was used to search for the origin and to confirm the structure of the characteristic fragment ion. The CAD spectra of the molecular-related ions, [M – H]+,M+• and [M + H]+, demonstrated that this characteristic fragment ion was not derived from any of these precursor ions. The CAD spectra of the characteristic fragment ion, which originated from O-acyl oximes, were very similar to those from free oximes and these results indicated that the fragment ion had the same structure. It was concluded that the degradation, under FAB conditions, was caused by a reductive reaction of the oxime moiety (–O–N=C) in O-acyl oximes regardless of its acyl moiety and that the degradation was initiated by the thiol group(s) in the matrix. The abundance of the ion originating from reductive degradation increased with increasing irradiation time with the xenon neutral beam.
Magnetic Resonance in Chemistry | 1987
Wasuke Kamisak; Chie Honda; Kiyoko Suwa; Koichiro Isoi
Magnetic Resonance in Chemistry | 1984
Wasuke Kamisako; Kiyoko Suwa; Kayoko Morimoto; Koichiro Isoi
Chemical & Pharmaceutical Bulletin | 1995
Kinuko Terada; Chie Honda; Kiyoko Suwa; Shizuyo Takeyama; Hisae Oku; Wasuke Kamisako
Magnetic Resonance in Chemistry | 1987
Wasuke Kamisako; Kiyoko Suwa; Chie Honda; Koichiro Isoi; Hiroshi Nakai; Motoo Shiro; Katsunosuke Machida
Chemical & Pharmaceutical Bulletin | 2013
Yuta Takahashi; Shizuyo Horiyama; Chie Honda; Kiyoko Suwa; Kazuki Nakamura; Masaru Kunitomo; Shuichi Shimma; Michisato Toyoda; Hirofumi Sato; Motohiro Shizuma; Mitsuo Takayama
Chemical & Pharmaceutical Bulletin | 2002
Shizuyo Horiyama; Kiyoko Suwa; Masae Yamaki; Hiromi Kataoka; Toyoshi Katagi; Mitsuo Takayama; Takae Takeuchi
Biological & Pharmaceutical Bulletin | 1996
Kinuko Terada; Kiyoko Suwa; Shizuyo Takeyama; Chie Honda; Wasuke Kamisako
Chemical & Pharmaceutical Bulletin | 2002
Chie Honda; Kiyoko Suwa; Shizuyo Takeyama; Wasuke Kamisako
Chemical & Pharmaceutical Bulletin | 2014
Shizuyo Horiyama; Yuta Takahashi; Mayuko Hatai; Chie Honda; Kiyoko Suwa; Atsushi Ichikawa; Noriko Yoshikawa; Kazuki Nakamura; Masaru Kunitomo; Sachiko Date; Tsutomu Masujima; Mitsuo Takayama