Characterization of the complex formation of 1,6-anhydro-beta-maltotriose with potassium using 1H and 39K NMR spectroscopy.
The (1)H and (39)K longitudinal relaxation times (T(1)) and (1)H diffusion coefficients were measured to investigate the complex formation of 1,6-anhydro-beta-maltotriose and potassium ions. Although the (1)H-T(1) values of H3', H5', H1'' and H4'' decreased in the presence of potassium ions, (1)H chemical shifts and (1)H diffusion coefficients did not show significant changes. The long-range coupling constants of (3)J(C-H) around the glycosyl bonds did not show significant changes either. In the measurements of (39)K spectra, the (39)K signal obviously broadened and the (39)K-T(1) values decreased in the presence of 1,6-anhydro-beta-maltotriose, indicating the complex formation of 1,6-anhydro-beta-maltotriose and potassium ions. These results indicate that the conformation and molecular volume were unaffected in the complex formation.
Kato
Takayuki
T
Graduate School of Chemistry, Meisei University, Hodokubo, Hino, Tokyo 191-8506, Japan.
Tsubono
Koji
K
Kamo
Osamu
O
Kato
Toshiyo
T
Furihata
Kazuo
K
Fujimoto
Takashi
T
Machinami
Tomoya
T
Tashiro
Mitsuru
M