2010年11月
Gelation Behavior by the Lanthanoid Adsorption of the Cyanobacterial Extracellular Polysaccharide
BIOMACROMOLECULES
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- 巻
- 11
- 号
- 11
- 開始ページ
- 3172
- 終了ページ
- 3177
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1021/bm101012u
- 出版者・発行元
- AMER CHEMICAL SOC
The self-organization behavior of an extracellular polysaccharide (sacran) extracted from the cyanobacterium Aphanothece sacrum in response to lanthanoid ion adsorption was investigated. Consequently, cryogenic TEM images revealed that sacran could be cross-linked by Nd(3+) trivalent ions and formed a fibrous nanostructural network containing water. Furthermore, sacran adsorbed trivalent metal ions at a 3: 1 ratio, which was the theoretical ionic adsorption and showed more efficient adsorption than alginate based on electric conductivity titration. The critical gelation concentrations. C(g), where sacran formed tough gels upon metal ion binding were estimated. The C(g) for trivalent metal ions was lower than that for divalent ions, and the C(g) for lanthanoid ions was particularly low at 10(-3) to 10(-4) M, changing every four elemental numbers. The extracellular matrix of Aphanothece sacrum, sacran, may adsorb metal ions to create fibrous nanostructures that reinforce the jelly matrix.
- リンク情報
- ID情報
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- DOI : 10.1021/bm101012u
- ISSN : 1525-7797
- Web of Science ID : WOS:000283810900045