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Psychorheology of ketchup
Štern, Petr ; Pokorný, J. ; Panovská, Z. ; Šedivá, A. ; Vykutilová, T.
A series of twelve ketchups picked up at the Czech markets was analysed at the temperatures 230C and 450C. There were determined the basic rheological characteristics (static yield stress, apparent viscosity, thixotropy, and viscoelasticity) using a rotational rheometer RheoStress 300 (TermoHaake Karlsruhe, Germany) and textural properties using sensor analysis. With the help of correlation of rheological and sensorical data there were derived close functional dependencies with large values of correlation coefficients.
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Psychorheology of soft margarines
Štern, Petr ; Pokorný, J. ; Panovská, Z. ; Seifert, P. ; Svoboda, Z. ; Novák, B.
This paper summarises the preliminary results form the research into the influence that conditions of agitation has on the progression of the aggregation process and on some of the properties of formed aggregates affecting the efficiency of separation processes. These results show that the applied velocity gradient G, the period of its action T and the distribution of a velocity field in the agitated volume of water influence the number of aggregates, their size and shape in a significant manner. Smaller and denser aggregates of a homogenous size and more resistant to breaking-up are formed with higher velocity gradient.
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Psychorheology of low-fat spreads
Štern, Petr ; Pokorný, J. ; Jedelská, M. ; Panovská, Z. ; Seifert, P. ; Svoboda, Z. ; Novák, B.
Statistically significant relations, either linear or semilogarithmic,were obtained between the rheological and sensory data. A close linear relationship between the sensory texture and the flavour was observed. On the basis of the rheological and sensory measurements, it may be concluded that the rheometry could be used for the prediction of the texture and flavour acceptances of fat emulsions with a fair degree of accuracy.
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