caa a22 4500 465787355 CHVBK 20180323112013.0 cr unu---uuuuu 170327e19901101xx s 000 0 eng 10.1007/BF00395579 doi (NATIONALLICENCE)springer-10.1007/BF00395579 Structure characterization of alginate and conformational behaviors of various alkali-metal alginates in solution [Elektronische Daten] [Hiroyuki Kawarada, Asako Hirai, Hisashi Odani, Takeo Lida, Akio Nakajima] Summary: The M/G ratio, i. e., number-ratio of D-mannuronate (M) to L-gluronate (G), and diad (MM, GG, MG, etc.) and triad (MMM, MMG, MGM, etc.) frequencies were determined with 100 MHz 13C-NMR spectra for two alginate samples, M-rich and G-rich samples. The M/G ratios obtained were in accord with those determined from chemical analysis on hydrolyzed products fairly well. Molecular chain dimensions in solution were investigated by viscosity method for five alkali-metal alginates carrying Li, Na, K, Rb and Cs, and the results were discussed based on ion radius and electronegativity of alkali-metals. Finally, ion-exchange characteristics of these alginates by Ca++ ion were interpreted with M/G ratio and electronegativity. Springer-Verlag, 1990 Kawarada Hiroyuki Department of Applied Chemistry, Osaka Institute of Technology, Asahi-ku, 535, Osaka, Japan aut Hirai Asako Institute for Chemical Research, Kyoto University, Uji, 611, Kyoto, Japan aut Odani Hisashi Institute for Chemical Research, Kyoto University, Uji, 611, Kyoto, Japan aut Lida Takeo Department of Applied Chemistry, Osaka Institute of Technology, Asahi-ku, 535, Osaka, Japan aut Nakajima Akio Department of Applied Chemistry, Osaka Institute of Technology, Asahi-ku, 535, Osaka, Japan aut Polymer Bulletin Springer-Verlag 24/5(1990-11-01), 551-557 0170-0839 24:5<551 1990 24 289 https://doi.org/10.1007/BF00395579 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00395579 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kawarada Hiroyuki Department of Applied Chemistry, Osaka Institute of Technology, Asahi-ku, 535, Osaka, Japan aut NATIONALLICENCE 700 1- Hirai Asako Institute for Chemical Research, Kyoto University, Uji, 611, Kyoto, Japan aut NATIONALLICENCE 700 1- Odani Hisashi Institute for Chemical Research, Kyoto University, Uji, 611, Kyoto, Japan aut NATIONALLICENCE 700 1- Lida Takeo Department of Applied Chemistry, Osaka Institute of Technology, Asahi-ku, 535, Osaka, Japan aut NATIONALLICENCE 700 1- Nakajima Akio Department of Applied Chemistry, Osaka Institute of Technology, Asahi-ku, 535, Osaka, Japan aut NATIONALLICENCE 773 0- Polymer Bulletin Springer-Verlag 24/5(1990-11-01), 551-557 0170-0839 24:5<551 1990 24 289 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer