Density and viscosity of Malus floribunda juice as a function of concentration and temperature

Density for cloudy and depectinised juice of Malus floribunda was determine d in a concentration range from 17 to 70 degrees Brix at 25 degrees C. Dens ity values were similar to the ones of common apple and were linearly corre lated with soluble solids concentration. The influence of temperature and c oncentration on the rheological behaviour of depectinised juice of Malus fl oribunda has been studied in a temperature range from 10 degrees C to 60 de grees C, and concentrations between 40 and 70 degrees Brix. The depectinise d juice has Newtonian behaviour and viscosity variation with temperature fo llowing the Arrhenius-Guzman equation, with activation energy values betwee n 26.6 and 64.8 kJ gmol(-1). A relationship between viscosity, temperature and soluble solids concentration has been proposed. (C) 1999 Elsevier Scien ce Ltd. All rights reserved.