Rheological Characteristics of Alginate Isolated from Commercially Cultured Nemacystus decipiens (Itomozuku)
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- Teruya Takeshi
- Department of Bioscience and Biotechnology, University of the Ryukyus
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- Tamaki Yukihiro
- Department of Bioscience and Biotechnology, University of the Ryukyus
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- Konishi Teruko
- Department of Bioscience and Biotechnology, University of the Ryukyus
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- Tako Masakuni
- Department of Bioscience and Biotechnology, University of the Ryukyus
Bibliographic Information
- Other Title
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- 養殖イトモズクから分離したアルギン酸のレオロジー特性
- Rheological characteristics of alginate isolated from commercially cultured Namacystus decipiens (Itomozuku)
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Abstract
The non-Newtonian behavior and storage modulus of an alginate isolated from Nemacystus decipiens which had been harvested in Uruma City (Okinawa, Japan) in aqueous solutions were investigated. Gelation occurred at a concentration of 0.5% of the alginate on addition of a mixed solution of NaCl (0.1%), KCl (0.1%) and CaCl2 (0.1%) at room temperature (25°C). The flow curves, at 35°C, of the alginate showed plastic behavior at various concentrations. The storage modulus of the alginate increased with an increase in concentration and decreased gradually with an increase in temperature up to 50°C, which was estimated to be a transition temperature; then it, on the contrary, increased gradually with a further increase in the temperature and showed the maximum value at a temperature of 60, 70 and 65°C at 0.3, 0.5 and 0.7%, respectively. The storage modulus of the alginate showed a large value even in the presence of urea (4.0 M). The storage modulus of the alginate showed a very large value at the pH range of 6.0-7.2, but very small at pH 4.0. However, a comparable large storage modulus was observed in the alkaline range (pH 9.0-11.0). Intra- and intermolecular Ca2+-bridges may play a dominant role in the gel formation of alginate molecules in the presence of Ca2+ ions with ionic bonding and electrostatic forces of attraction. The hydrophobic interaction may take place on the L-guluronic acid-rich homopolymeric blocks of the alginate molecules in the high temperature range.
Journal
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- Journal of Applied Glycoscience
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Journal of Applied Glycoscience 57 (1), 7-12, 2010
The Japanese Society of Applied Glycoscience
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Details 詳細情報について
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- CRID
- 1390001206292950656
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- NII Article ID
- 10025997174
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- NII Book ID
- AN10453916
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- DOI
- 10.5458/jag.57.7
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- ISSN
- 18807291
- 13447882
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- NDL BIB ID
- 10587851
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- Text Lang
- en
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- Data Source
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- JaLC
- IRDB
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed