EVALUATION OF RHEOLOGICAL PROPERTIES OF COMMERCIAL NATIVE STARCHES
Journal Title: Żywność. Nauka. Technologia. Jakość - Year 2011, Vol 18, Issue 3
Abstract
Based on the research into five commonly used natural starches (potato, usual corn, waxy corn, wheat, and tapioca), an attempt was made to determine the basic factors appearing decisive for the correctness of measuring the rheological properties of the starches. The research was carried out using a Brabender viscograph, a Brookfield viscometer, and a HAAKE rheometer. It was shown that various methods applied to evaluate starch properties could be complementary to each other. The analysis of the course of the pasting process by the Brabender viscograph provides significant technological information, although it does not make possible to determine absolute rheological quantities; the information obtained from this analysis are reflected in the results obtained using other methods. The viscosity of starch pastes, which are non- Newtonian fluids, depends not only on the concentration, temperature, and shear rate, but, also, on the preparation method of starch paste. In order to compare the starch paste viscosity data measured using different apparatuses, it is necessary to precisely determine the share rate at which the measurement is taken. The research results, obtained using the apparatuses in which only the angular velocity of spindle is set (for example Brookfield viscometer) are not comparable with the results obtained from the measurements taken using other devices.
Authors and Affiliations
Joanna Le Thanh-Blicharz, Zbyszko Lubiewski, Ewa Voelkel, Grażyna Lewandowicz
Keywords
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- EP ID EP121597
- DOI 10.15193/zntj/2011/76/053-065
- Views 49
- Downloads 0
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