Anisotropic structure of calcium-induced alginate gels by optical and small-angle X-ray scattering measurements

Yasuyuki Maki, Kei Ito, Natsuki Hosoya, Chikayoshi Yoneyama, Kazuya Furusawa, Takao Yamamoto, Toshiaki Dobashi, Yasunobu Sugimoto, Katsuzo Wakabayashi

研究成果: Contribution to journalArticle査読

44 被引用数 (Scopus)

抄録

It was more than 50 years ago that an appearance of birefringence in alginate gels prepared under cation flow was reported for the first time, however, the anisotropic structure of the alginate gel has not been studied in detail. In the present study, anisotropic Ca-alginate gels were prepared within dialysis tubing in a high Ca2+-concentration external bath, and optical and small-angle X-ray scattering (SAXS) measurements were performed to characterize the structure of the gel. The observations of the gel with crossed polarizers and with circular polarizers revealed the molecular orientation perpendicular to the direction of Ca2+ flow. Analyses of the SAXS intensity profiles indicated the formation of rod-like fibrils consisting of a few tens of alginate molecules and that the anisotropy of the gel was caused by the circumferential orientation of the large fibrils. From the observed asymmetric SAXS pattern, it was found that the axis of rotational symmetry of the anisotropic structure was parallel to the direction of Ca2+ flow. The alignment factor (Af) calculated from the SAXS intensity data confirmed that the orientation of the fibrils was perpendicular to the direction of Ca2+ flow.

本文言語英語
ページ(範囲)2145-2152
ページ数8
ジャーナルBiomacromolecules
12
6
DOI
出版ステータス出版済み - 6 13 2011
外部発表はい

All Science Journal Classification (ASJC) codes

  • バイオエンジニアリング
  • 生体材料
  • ポリマーおよびプラスチック
  • 材料化学

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