The flow properties of a series of kefiran aqueous solutions with concentrations ranging from 0.25 to 4.0% (w/v) were examined at 4, 25 or 40 °C under controlled shear rate mode and over six orders of magnitude.The results indicated that the flow behavior of kefiran systems in solution is that of a pseudoplastic fluid at low shear rates whereas at high shear rates is that of a Newtonian one. Freeze-thaw treatment of kefiran solutions affected their structure, forming quasi-like cryogels whose consistency is concentration depended whereas their network integrity depended, possibly, on hydrogen bonding. Thermal treatment of kefiran solutions in two consecutive freeze-thaw cycles indicated that the texture of the systems remained virtually unchanged. Lubricated squeeze flow studies of kefiran quasi cryogels showed that their elongational viscosity was concentration dependent and they exhibited pseudoplasticity.
Food Hydrocolloids – Elsevier
Published: Jun 1, 2018
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