Effect of combined ultrasonic and heat treatment (thermoultrasonication) on the survival of a strain ofStaphylococcus aureus

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Abstract
Summary: The combined effect of ultrasonic waves (20 kHz, 150 W) and heat treatment applied simultaneously (thermoultrasonication) on the survival of a strain ofStaphylococcus aureuswas studied in 0·05 m-phosphate buffer pH 6·8 and ultra-heat-treated whole milk. This combined process decreased by 63% the decimal reduction times for the heat treatment when the organism was suspended in buffer and by 43% when suspended in milk. These effects were much greater than the additive effect of the two agents considered independently.