NDLI: Irradiation Sensitivity of Planktonic and Biofilm-Associated Escherichia coli O157:H7 Isolates Is Influenced by Culture Conditions▿

Content Provider	PubMed Central
Author	Niemira, Brendan A.
Copyright Year	2007
Abstract	Ionizing radiation effectively inactivates Escherichia coli O157:H7, but the efficacy of the process against biofilm cells versus that against free-living planktonic cells is not well documented. The radiation sensitivity of planktonic or biofilm cells was determined for three isolates of E. coli O157:H7 (C9490, ATCC 35150, and ATCC 43894). Biofilms were formed on sterile glass slides incubated at 37°C for either 24 h, 48 h, or 72 h. The biofilm and planktonic cultures were gamma irradiated at doses ranging from 0.0 (control) to 1.5 kGy. The dose of radiation value required to reduce the population by 90% (D10) was calculated for each isolate, culture, and maturity based on viable populations at each radiation dose. For each of the times sampled, the D10 values of isolate 43894 planktonic cells (0.454 to 0.479 kGy) were significantly (P < 0.05) higher than those observed for biofilm cells (0.381 to 0.385 kGy), indicating a significantly increased sensitivity to irradiation for cells in the biofilm habitat. At the 24-h sampling time, isolate C9490 showed a similar pattern, in which the D10 values of planktonic cells (0.653 kGy) were significantly higher than those for biofilm cells (0.479 kGy), while isolate 35150 showed the reverse, with D10 values of planktonic cells (0.396 kGy) significantly lower than those for biofilm cells (0.526 kGy). At the 48-h and 72-h sampling times, there were no differences in radiation sensitivities based on biofilm habitat for C9490 or 35150. Biofilm-associated cells, therefore, show a response to irradiation which can differ from that of planktonic counterparts, depending on the isolate and the culture maturity. Culture maturity had a more significant influence on the irradiation efficacy of planktonic cells but not on biofilm-associated cells of E. coli O157:H7.
Related Links	http://dx.doi.org/10.1128/aem.02764-06
Ending Page	3244
Page Count	6
Starting Page	3239
File Format	PDF
ISSN	00992240
e-ISSN	10985336
Journal	Applied and Environmental Microbiology
Issue Number	10
Volume Number	73
Language	English
Publisher	American Society for Microbiology
Publisher Date	2007-05-15
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Biotechnology Food Science Ecology Applied Microbiology and Biotechnology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Ecology Food Science Applied Microbiology and Biotechnology Biotechnology

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