Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/35768
Title: Rheological behaviors of an exopolysaccharide from fermentation medium of a Cordyceps sinensis fungus (Cs-HK1)
Authors: Sun, FY
Huang, QL
Wu, JY 
Keywords: Exopolysaccharide
Rheological behaviors
Cordyceps sinensis
Issue Date: 2014
Publisher: Elsevier
Source: Carbohydrate polymers, 2014, v. 114, p. 506-513 How to cite?
Journal: Carbohydrate polymers 
Abstract: The rheological behaviors of an exopolysaccharide (EPS) from a Cordyceps sinensis fungus fermentation were investigated. The intrinsic viscosity of 1986 +/- 55 mL/g indicated an extended and rigid chain for EPS. Shear-thinning behavior was observed and became apparent with increasing concentration. According to cross model, two critical transition concentrations (c* and c**) from dilute solution to semidilute and then to concentrated domain were 0.45 and 6.14 mg/mL. Flow activation energy was calculated by Arrhenius equation and decreased with increasing concentration, indicating a lower sensitivity to temperature. From dynamic frequency sweep, EPS system was classified to three regions including dilution solution (1.25 mg/mL), entanglement network (3.75 and 5.00 mg/mL) and weak gel (>= 7.50 mg/mL). Notably, the increase in eta* at high frequencies was attributed to a large flow resistance depended on the rigid chain of EPS. Based on Winter-Chambon criterion, EPS formed gel at 2.6 mg/mL (c(gel)) and showed typical weak gel from temperature ramp and repetitive strain sweep.
URI: http://hdl.handle.net/10397/35768
ISSN: 0144-8617
DOI: 10.1016/j.carbpol.2014.08.055
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