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Rheopectic Behavior for Aqueous Solutions of Megamolecular Polysaccharide Sacran
The rheopectic behavior of sacran aqueous solutions, a natural giant molecular polysaccharide with a molecular weight of 1.6 × 10(7) g/mol, was investigated. When a low shear was applied to 1.0 wt.% sacran solution, the shear viscosity increased from 7.2 to 34 Pa·s. The increment in the viscosity wa...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7023324/ https://www.ncbi.nlm.nih.gov/pubmed/31963576 http://dx.doi.org/10.3390/biom10010155 |
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author | Amat Yusof, Fitri Adila Yamaki, Miho Kawai, Mika Okajima, Maiko K. Kaneko, Tatsuo Mitsumata, Tetsu |
author_facet | Amat Yusof, Fitri Adila Yamaki, Miho Kawai, Mika Okajima, Maiko K. Kaneko, Tatsuo Mitsumata, Tetsu |
author_sort | Amat Yusof, Fitri Adila |
collection | PubMed |
description | The rheopectic behavior of sacran aqueous solutions, a natural giant molecular polysaccharide with a molecular weight of 1.6 × 10(7) g/mol, was investigated. When a low shear was applied to 1.0 wt.% sacran solution, the shear viscosity increased from 7.2 to 34 Pa·s. The increment in the viscosity was enhanced as the shear rate decreased. The shear viscosity was independent of the time at a shear rate of 0.8 s(−1); simultaneously, thixotropic behavior was observed at shear rates higher than 1.0 s(−1). A crossover was observed at 0.15 wt.% for the concentration dependence of both the viscosity increase and zeta potential, which was the vicinity of the helix transition concentration or gelation concentration. It was clear that the molecular mechanism for the rheopexy was different at lower and higher regions of the crossover concentration. |
format | Online Article Text |
id | pubmed-7023324 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-70233242020-03-12 Rheopectic Behavior for Aqueous Solutions of Megamolecular Polysaccharide Sacran Amat Yusof, Fitri Adila Yamaki, Miho Kawai, Mika Okajima, Maiko K. Kaneko, Tatsuo Mitsumata, Tetsu Biomolecules Article The rheopectic behavior of sacran aqueous solutions, a natural giant molecular polysaccharide with a molecular weight of 1.6 × 10(7) g/mol, was investigated. When a low shear was applied to 1.0 wt.% sacran solution, the shear viscosity increased from 7.2 to 34 Pa·s. The increment in the viscosity was enhanced as the shear rate decreased. The shear viscosity was independent of the time at a shear rate of 0.8 s(−1); simultaneously, thixotropic behavior was observed at shear rates higher than 1.0 s(−1). A crossover was observed at 0.15 wt.% for the concentration dependence of both the viscosity increase and zeta potential, which was the vicinity of the helix transition concentration or gelation concentration. It was clear that the molecular mechanism for the rheopexy was different at lower and higher regions of the crossover concentration. MDPI 2020-01-17 /pmc/articles/PMC7023324/ /pubmed/31963576 http://dx.doi.org/10.3390/biom10010155 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Amat Yusof, Fitri Adila Yamaki, Miho Kawai, Mika Okajima, Maiko K. Kaneko, Tatsuo Mitsumata, Tetsu Rheopectic Behavior for Aqueous Solutions of Megamolecular Polysaccharide Sacran |
title | Rheopectic Behavior for Aqueous Solutions of Megamolecular Polysaccharide Sacran |
title_full | Rheopectic Behavior for Aqueous Solutions of Megamolecular Polysaccharide Sacran |
title_fullStr | Rheopectic Behavior for Aqueous Solutions of Megamolecular Polysaccharide Sacran |
title_full_unstemmed | Rheopectic Behavior for Aqueous Solutions of Megamolecular Polysaccharide Sacran |
title_short | Rheopectic Behavior for Aqueous Solutions of Megamolecular Polysaccharide Sacran |
title_sort | rheopectic behavior for aqueous solutions of megamolecular polysaccharide sacran |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7023324/ https://www.ncbi.nlm.nih.gov/pubmed/31963576 http://dx.doi.org/10.3390/biom10010155 |
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