Abstract
We have investigated the effects of combined use of ultrasonic irradiation with NaClO on the growth of yeast cells and compared this effects with that of NaClO or ultrasound irradiation only. It has reported that the inactivation of yeast cells by ultrasonic irradiation. In this study, the growth activites about the bactericidal and bacteriostatic effect of the chemicals on the microbial cells. It was shown that ultrasonic irradiation (27.5kHz, 77W) had synergistic effect on inactivation of yeast cells by NaClO suggesting that ultrasonic irradiation would cause the membrane damage on yeast cells increasing permeability of the chemicals. However, when the processing order was changed, we did not obtain the synergistic effect in the bactericidal effect. In the sterilization of the microorganism, we found that the bactericidal effect is different when the processing order is changed.
