Rb+ and Na+ spin relaxation in aqueous gellan solutions and implication of selective site binding of alkali metal ions

Annaka Masahiko, R. Takahashi, T. Nakahira, Masayuki Tokita, T. Matsuura

研究成果: ジャーナルへの寄稿記事

5 引用 (Scopus)

抄録

87Rb NMR was applied to investigate the site binding of Rb+ ions in gellan gum gels. The temperature dependence of the transverse and longitudinal relaxation NMR relaxation rates of 87Rb+ ion and 23Na+ ion have been compared in aqueous 5% (w/v) rubidium-type and sodium-type gellan. In each sample, the relaxation rates were sensitive to the conformation (helix or random coil). In rubidium-type gellan, significant line-broadening effects (losses in intensity) were found, which is due to the presence of cation-binding sites in the ordered conformation. In sodium-type gellan, such an enhancement of the relaxation was not observed. These results indicated that gellan gum produced highly selective binding sites for alkali metal ions, in which Rb+ ion bound more strongly than Na+ ion. The 87Rb NMR line shift suggested selective site binding of ions to form the cross-linking domains in gellan gels.

元の言語英語
ページ(範囲)635-640
ページ数6
ジャーナルBiomacromolecules
2
発行部数3
DOI
出版物ステータス出版済み - 10 4 2001

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Alkali Metals
Alkali metals
Binding sites
Metal ions
Binding Sites
Ions
Rubidium
Nuclear magnetic resonance
Conformations
Gels
Sodium
gellan gum
Cations
Positive ions

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Biomaterials
  • Polymers and Plastics
  • Materials Chemistry

これを引用

Rb+ and Na+ spin relaxation in aqueous gellan solutions and implication of selective site binding of alkali metal ions. / Masahiko, Annaka; Takahashi, R.; Nakahira, T.; Tokita, Masayuki; Matsuura, T.

:: Biomacromolecules, 巻 2, 番号 3, 04.10.2001, p. 635-640.

研究成果: ジャーナルへの寄稿記事

Masahiko, Annaka ; Takahashi, R. ; Nakahira, T. ; Tokita, Masayuki ; Matsuura, T. / Rb+ and Na+ spin relaxation in aqueous gellan solutions and implication of selective site binding of alkali metal ions. :: Biomacromolecules. 2001 ; 巻 2, 番号 3. pp. 635-640.
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abstract = "87Rb NMR was applied to investigate the site binding of Rb+ ions in gellan gum gels. The temperature dependence of the transverse and longitudinal relaxation NMR relaxation rates of 87Rb+ ion and 23Na+ ion have been compared in aqueous 5{\%} (w/v) rubidium-type and sodium-type gellan. In each sample, the relaxation rates were sensitive to the conformation (helix or random coil). In rubidium-type gellan, significant line-broadening effects (losses in intensity) were found, which is due to the presence of cation-binding sites in the ordered conformation. In sodium-type gellan, such an enhancement of the relaxation was not observed. These results indicated that gellan gum produced highly selective binding sites for alkali metal ions, in which Rb+ ion bound more strongly than Na+ ion. The 87Rb NMR line shift suggested selective site binding of ions to form the cross-linking domains in gellan gels.",
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T1 - Rb+ and Na+ spin relaxation in aqueous gellan solutions and implication of selective site binding of alkali metal ions

AU - Masahiko, Annaka

AU - Takahashi, R.

AU - Nakahira, T.

AU - Tokita, Masayuki

AU - Matsuura, T.

PY - 2001/10/4

Y1 - 2001/10/4

N2 - 87Rb NMR was applied to investigate the site binding of Rb+ ions in gellan gum gels. The temperature dependence of the transverse and longitudinal relaxation NMR relaxation rates of 87Rb+ ion and 23Na+ ion have been compared in aqueous 5% (w/v) rubidium-type and sodium-type gellan. In each sample, the relaxation rates were sensitive to the conformation (helix or random coil). In rubidium-type gellan, significant line-broadening effects (losses in intensity) were found, which is due to the presence of cation-binding sites in the ordered conformation. In sodium-type gellan, such an enhancement of the relaxation was not observed. These results indicated that gellan gum produced highly selective binding sites for alkali metal ions, in which Rb+ ion bound more strongly than Na+ ion. The 87Rb NMR line shift suggested selective site binding of ions to form the cross-linking domains in gellan gels.

AB - 87Rb NMR was applied to investigate the site binding of Rb+ ions in gellan gum gels. The temperature dependence of the transverse and longitudinal relaxation NMR relaxation rates of 87Rb+ ion and 23Na+ ion have been compared in aqueous 5% (w/v) rubidium-type and sodium-type gellan. In each sample, the relaxation rates were sensitive to the conformation (helix or random coil). In rubidium-type gellan, significant line-broadening effects (losses in intensity) were found, which is due to the presence of cation-binding sites in the ordered conformation. In sodium-type gellan, such an enhancement of the relaxation was not observed. These results indicated that gellan gum produced highly selective binding sites for alkali metal ions, in which Rb+ ion bound more strongly than Na+ ion. The 87Rb NMR line shift suggested selective site binding of ions to form the cross-linking domains in gellan gels.

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