For the ohmic heating experiments, the
effects of the voltage and the solids content were evaluated. Most of
the independent variables e quadratic and linear voltage variables,
the linear solids content variable and the interaction variable e had
significant effects on the response values, the exception being the
quadratic effect of the solids content. A second-order polynomial
model was obtained, and the equation shows that anthocyanin
degradation increases as both parameters analyzed increases. The
level of degradation varied from 5.7 to 14.7% for the ohmic heating
experiments, and for the conventional heating experiment, the
level of degradation was 7.2%. The percentage of anthocyanin degradation was similar or even
lower than those obtained with conventional heating when the
ohmic heating process was used with low voltage gradients. When
higher voltage gradients were applied, the levels of degradation
were greater for the ohmic-heated pulp
For the ohmic heating experiments, theeffects of the voltage and the solids content were evaluated. Most ofthe independent variables e quadratic and linear voltage variables,the linear solids content variable and the interaction variable e hadsignificant effects on the response values, the exception being thequadratic effect of the solids content. A second-order polynomialmodel was obtained, and the equation shows that anthocyanindegradation increases as both parameters analyzed increases. Thelevel of degradation varied from 5.7 to 14.7% for the ohmic heatingexperiments, and for the conventional heating experiment, thelevel of degradation was 7.2%. The percentage of anthocyanin degradation was similar or evenlower than those obtained with conventional heating when theohmic heating process was used with low voltage gradients. Whenhigher voltage gradients were applied, the levels of degradationwere greater for the ohmic-heated pulp
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