Rheology and characteristics of sulfated polysaccharides from chlorophytan seaweeds Ulva fasciata

•Ulva fasciata polysaccharide (UFP) behaved as shear-thickening fluids.•The rod-climbing effects and cold-set gelation were investigated.•The dependence of concentration, temperature, pH and salts was different.•The ξ-potential was higher under extreme pH, while the size obtained maximum at the natu...

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Bibliographic Details
Published in:Carbohydrate polymers 2014-11, Vol.113, p.365-372
Main Authors: Shao, Ping, Qin, Minpu, Han, Longfei, Sun, Peilong
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Ions - chemistry
Natural polymers
Necklace-type structures
Physicochemistry of polymers
Polysaccharides - chemistry
Rheological characteristics
Rheology
Seaweed - chemistry
Shear-thickening fluid
Sodium Chloride - metabolism
Solutions - chemistry
Starch and polysaccharides
Sulfates - chemistry
Ulva - chemistry
Ulva fasciata
Water - chemistry
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Summary:•Ulva fasciata polysaccharide (UFP) behaved as shear-thickening fluids.•The rod-climbing effects and cold-set gelation were investigated.•The dependence of concentration, temperature, pH and salts was different.•The ξ-potential was higher under extreme pH, while the size obtained maximum at the natural pH. The rheological characteristics of polysaccharides which were extracted and separated from Ulva fasciata (UFP) were investigated in aqueous solutions under conditions of concentration, temperature, solution pH and salt concentrations. It was described by the power-law model with a consistency index (k) and a flow behavior index (n). The rheology results showed UFP exhibited as a shear-thickening fluid and a possible mechanism was proposed to explain this phenomenon that might be the collapse of UFP necklace-type structures. UFP characteristics were evaluated by determining the chemical analysis and zeta potential. The findings indicated UFP may consist of partially ulvan, as the results were in accordance with the ulvan structure. Additionally, a rod-climbing effect and cold-set gelation were observed in the UFP semidilute solution. Therefore, the cold-set gelling properties and unique shear-thickening fluid properties in this work could be valuable for the exploration of U. fasciata as a new source of water-soluble gelling polysaccharides.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2014.07.008