The Effect of Mannuronic Acid/Guluronic Acid Ratio on Gelation by Mg2+ Ions of Alginate Aqueous Solution

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Other Title
  • アルギン酸水溶液のMg2+イオンによるゲル化に及ぼすマンヌロン酸/グルロン酸比の影響

Description

The alginate is an anionic polysaccharide which is composed of 1, 4-linked β -D-mannuronic acid (M) and 1, 4-linked α -L-guluronic acid (G). It is well-known that a sodium alginate aqueous solution forms a gel by introducing divalent metal inos. In the present study, the effect of 114/G ratio on the gelation by Mg2+ ions is investigated by way of rheological and small angle X-ray scattering (SAXS) measurements using a cone-plate type rheometer and a 6 m point focusing SAXS camera, respectively. The guluronic acid rich alginate solution forms the gel at lower concentration of added MgC12 than the mannuronic acid rich alginate. This is because the guluronic acid rich alginate has a higher affinity for Mg2+ than the mannuronic acid rich alginate. SAXS measurements revealed that the gel of the alginate aqueous system has a mass fractal structure at the gel point and the fractal dimension of the structure is 1.45.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1993 (8), 978-981, 1993-08-10

    The Chemical Society of Japan

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