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Structure characterization of alginate and conformational behaviors of various alkali-metal alginates in solution

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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.

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Authors and Affiliations

  1. Department of Applied Chemistry, Osaka Institute of Technology, Asahi-ku, 535, Osaka, Japan

    Hiroyuki Kawarada, Takeo Lida & Akio Nakajima

  2. Institute for Chemical Research, Kyoto University, Uji, 611, Kyoto, Japan

    Asako Hirai & Hisashi Odani

Authors
  1. Hiroyuki Kawarada
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  2. Asako Hirai
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  3. Hisashi Odani
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  4. Takeo Lida
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  5. Akio Nakajima
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Kawarada, H., Hirai, A., Odani, H. et al. Structure characterization of alginate and conformational behaviors of various alkali-metal alginates in solution. Polymer Bulletin 24, 551–557 (1990). https://doi.org/10.1007/BF00395579

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  • DOI: https://doi.org/10.1007/BF00395579

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