The kinetics of the aqueous extraction of solubles from oranges has been investigated as a function of temperature (50-88°C). The data fit simple first order kinetics and indicate rate constants of between 4.8 x 10-4s-1and 2 x 10-3s-1This is equivalent to a half-life for the process of between 22 min and 7 min. The temperature-dependence of the kinetics of extraction was found to be similar to that obtained for the extraction of other foodstuffs, including the extraction of solubles from black tea. An activation energy of 37 kJ mol-1was obtained over the temperature range considered.
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