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Applied and Environmental Microbiology, May 2000, p. 2243-2247, Vol. 66, No. 5
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Differential Damage in Bacterial Cells by Microwave Radiation on the Basis of Cell Wall Structure

Im-Sun Woo,1 In-Koo Rhee,2 and Heui-Dong Park1,*

Department of Food Science and Technology1 and Department of Agricultural Chemistry,2 Kyungpook National University, Taegu, Korea

Received 16 August 1999/Accepted 11 February 2000

Microwave radiation in Escherichia coli and Bacillus subtilis cell suspensions resulted in a dramatic reduction of the viable counts as well as increases in the amounts of DNA and protein released from the cells according to the increase of the final temperature of the cell suspensions. However, no significant reduction of cell density was observed in either cell suspension. It is believed that this is due to the fact that most of the bacterial cells inactivated by microwave radiation remained unlysed. Scanning electron microscopy of the microwave-heated cells revealed severe damage on the surface of most E. coli cells, yet there was no significant change observed in the B. subtilis cells. Microwave-injured E. coli cells were easily lysed in the presence of sodium dodecyl sulfate (SDS), yet B. subtilis cells were resistant to SDS.

* Corresponding author. Mailing address: Department of Food Science and Technology, Kyungpook National University, 1370 Sankyuk, Taegu 702-701, Korea. Phone: 82-(53)-950-5774. Fax: 82-(53)-950-6772. E-mail: hpark{at}knu.ac.kr.

Applied and Environmental Microbiology, May 2000, p. 2243-2247, Vol. 66, No. 5
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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