From the parameters evaluated, only the number of colonies of
mesophilic and lactic acid bacteria was influenced by the experimental
conditions used in US treatment. The temperature and ultrasound
irradiation time presented no effect in TBARS, color and pH values.
The RSM analysis showed that the increase on the values of independent
variables affects the reduction of mesophilic (Fig. 1A) and lactic
acid bacteria counting (Fig. 1B). The models observed by the use of
RSM indicated linear and quadratic time, linear and quadratic temperature
and the interaction between linear time and linear temperature as