Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 81, Issue -, Pages 991-999Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2015.09.040
Keywords
Chia seed polysaccharide; Intrinsic viscosity; Critical concentration; Shear thinning; Depolymerization
Funding
- RMIT University
- CSIRO (Manufacturing Flagship), Melbourne, Australia
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Chia seed polysaccharide (CSP) was extracted from chia (Salvia hispanica) seeds, and its rheological and microstructural properties in aqueous solutions were studied. CSP solution exhibited Newtonian and shear thinning flow patterns depending on shear rate.when the concentration was <= 0.06% (w/v). CSP solutions at concentrations >0.06% (w/v) exhibited strong shear thinning behaviour within the shear rate tested (0.001-300 s(-1)). The transition from dilute to semi-dilute regime occurred at a critical concentration (C*) of 0.03 g dL(-1). The intrinsic viscosity was high (similar to 16 dL g(-1)) and concentration dependence of zero shear viscosity in the semi-dilute regime followed eta(0) proportional to C-2.7 relationship. The storage modulus (G') was higher than the loss modulus (G) at all experimental frequencies and their frequency dependence was negligible at all tested concentrations. Apparent shear viscosity was smaller than dynamic complex viscosity at equivalent values of deformation and G' varied with the square of concentration indicating a gel-like behaviour in CSP solutions within 0.02-3.0% (w/v) concentrations. Controlled acid hydrolysis of purified CSP yielded various low molecular fractions with fairly uniform polydispersity giving a Mark-Houwink-Sakurada relationship of intrinsic viscosity equaling to 1.52 x 10(-4) (molecular weight)(0.803) (dL g(-1)). (C) 2015 Elsevier B.V. All rights reserved.
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