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6 results on '"Hidaka, Yukio"'

4. An Ordering of Complexation Ability for a Series of Permethylated Aldopyranoses with Metal Cations in Solution. 1H-NMR Relaxation Probes

Author

Takai, Yoshio, Shizuma, Motohiro, Okumura, Yasuo, Hidaka, Yukio, Hanafusa, Terukiyo, Takahashi, Shigetoshi, and Sawada, Masami

Abstract

By using 1H-NMR relaxation technique, an ordering of complexation ability for a series of permethylated aldopyranoses with metal cations in solution has been determined, which is identical with that of the peak-intensity for the 1:1 adduct ions by FAB mass spectrometry.

Published
1991
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5. 1 : 1 Adduct Ion Formation of Simple Carbohydrate Derivatives with Cations Using FAB Mass Spectrometry. Comparison of O-Acetyl, N-Butyl, and O-Methyl Modifications

Author

Sawada, Masami, Shizuma, Motohiro, Takai, Yoshio, Yamada, Hitoshi, Tanaka, Takanori, Okumura, Yasuo, Hidaka, Yukio, Hanafusa, Terukiyo, and Takahashi, Shigetoshi

Abstract

The 1 : 1 adduct ion formation between a series of per-O-acetylated aldopyranoses (family 1) or N-butylated glycosylamines (family 2) and an organic/metallic cation (n-C8H17NH3+/K+or Li+) has been examined using quantitative FAB mass Spectrometry. The per-O-acetyl modifications dramatically lead to negated selectivity of the carbohydrates toward the cation which has been clearly observed in per-O-methyl modifications. On the other hand, the mono-N-butyl modifications provide a similar selectivity pattern to mono-O-methyl ones. These results are understood on the basis of electronic and structural considerations.

Published
1992
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