Document Detail

Inactivation of bacteria and yeast using high-frequency ultrasound treatment.
MedLine Citation:
PMID:  24835956     Owner:  NLM     Status:  Publisher    
High-frequency (850 kHz) ultrasound was used to inactivate bacteria and yeast at different growth phases under controlled temperature conditions. Three species of bacteria, Enterobacter aerogenes, Bacillus subtilis and Staphylococcus epidermidis as well as a yeast, Aureobasidium pullulans were considered. The study shows that high-frequency ultrasound is highly efficient in inactivating the bacteria in both their exponential and stationary growth phases, and inactivation rates of more than 99% were achieved. TEM observation suggests that the mechanism of bacteria inactivation is mainly due to acoustic cavitation generated free radicals and H2O2. The rod-shaped bacterium B. subtilis was also found to be sensitive to the mechanical effects of acoustic cavitation. The study showed that the inactivation process continued even after ultrasonic processing cessed due to the presence of H2O2, generated during acoustic cavitation. Compared to bacteria, the yeast A. pullulans was found to be more resistant to high-frequency ultrasound treatment.
Shengpu Gao; Yacine Hemar; Muthupandian Ashokkumar; Sara Paturel; Gillian D Lewis
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-5-1
Journal Detail:
Title:  Water research     Volume:  60C     ISSN:  1879-2448     ISO Abbreviation:  Water Res.     Publication Date:  2014 May 
Date Detail:
Created Date:  2014-5-19     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0105072     Medline TA:  Water Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  93-104     Citation Subset:  -    
Copyright Information:
Copyright © 2014 Elsevier Ltd. All rights reserved.
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