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Structural characteristics of crosslinking domain in gellan gum gel
Author(s) -
Yuguchi Yoshiaki,
Urakawa Hiroshi,
Kajiwara Kanji
Publication year - 1997
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19971200110
Subject(s) - gellan gum , radius of gyration , small angle x ray scattering , counterion , materials science , aqueous solution , scattering , ion , chemistry , analytical chemistry (journal) , chemical engineering , chromatography , organic chemistry , composite material , polymer , optics , physics , food science , engineering
Gellan gum samples having different counterions of TMA + (tetramethyl‐ammonium ion), Na + , K + and Cs + were prepared, and the small‐angle X‐ray scattering was observed from the aqueous solutions of those samples. A sharp peak appears in the SAXS profile at low temperature, indicating the electrostatic interaction between the domains composed of multiple gellan gum chains. The SAXS profile revealed a rigid rod‐like characteristics of gellan gum chain. The cross‐sectional radius of gyration was evaluated from the scattering profiles, and the gelation mechanism was discussed from the change of the cross‐sectional radius of gyration upon gel‐sol transition. Taking the difference of the scattering power of counter ions into account, the ion condensation due to gelation was evaluated from the excess scattering of Cs + gellan gum with respect to K + gellan gum in respective aqueous solutions.