Inactivation of Microbes by Non-thermal Ultrasound Sterilization and the Effects of Ultrasound Treatment Factors

Abstract

Abstract: The non-thermal disinfection of Escherichia coli and Staphylococcus aureus by ultrasound treatment were investigated. In this study, the effects of the ultrasound treatment factors, the medium properties and the treatment temperature were evaluated. The results showed that E.coli was susceptible to ultrasound treatment, while S.aureus had great resistance to the treatment. Inactivation of microbes were improved by strengthening power intensity, prolonging irradiation time and increasing temperature. The disinfection of microbes in culture medium was more effective than in distilled water. In a conclusion, everything which could strengthen the cavitation or weaken the cell structure should be effective in disinfection. No cell recovery was found occurring according to the result of viable clone counting after being storaged at 4℃.

Key words: ultrasound, non-thermal sterilization, inactivation, viable plate count

ZHOU Li-zhen,LI Bing,LI Lin,ZHANG Xi-mei. Inactivation of Microbes by Non-thermal Ultrasound Sterilization and the Effects of Ultrasound Treatment Factors[J]. FOOD SCIENCE, 2006, 27(12): 54-57.

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Inactivation of Microbes by Non-thermal Ultrasound Sterilization and the Effects of Ultrasound Treatment Factors

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