2. Materials and methods
The ohmic heating system explained in Icier and Ilicali
(2005a) was used in ohmic heating of fruit purees.
The peach and apricot purees were supplied by a commercial
fruit juice producer. The samples were taken
from the line before pasteurization. Total solid content,
total soluble solid content, pH and acidity values of the
fruit purees are given in Table 1. The samples were
poured through the thermocouple port; the electronic
temperature sensors were inserted and fitted. The distance
between two stainless steel electrodes were arranged
to apply different appropriate voltage gradients
to the purees. The diameter of the electrodes was 0.025
m. After the system was sealed, the sample was ohmically
heated up to a temperature of 70 C at 50 Hz frequency
using different voltages. Voltage, current,
temperature data were logged at 1 s time intervals during heating