Data from oranges of the Navel 1996 and Navel 1997 type
confirm the observation in previous studies27 that there was an
inverse correlation between the field power and duration of
exposure mainly expressed for 0.45 and 0.63 kW power. In case
of weaker field, longer microwave treatment is needed. Duration
of acceptable microwave heating was reduced for the higher
values of the field power because of burning of the material.
Kratchanova et al. had reported that the pretreatment of the
fruit material by microwave heating led to a considerable
increase in the yield and quality of pectin. These results were
confirmed by experimental data obtained by Ilina et al, Kohg
et al29 and Fishman et al during investigations into the
microwave treatment of citrus peels and apple pomace.