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Comparison of intense pulsed light- and ultraviolet (UVC)-induced cell damage in Listeria monocytogenes and Escherichia coli O157:H7

Title
Comparison of intense pulsed light- and ultraviolet (UVC)-induced cell damage in Listeria monocytogenes and Escherichia coli O157:H7
Authors
Cheigh C.-I.Park M.-H.Chung M.-S.Shin J.-K.Park Y.-S.
Ewha Authors
정명수
SCOPUS Author ID
정명수scopus
Issue Date
2012
Journal Title
Food Control
ISSN
0956-7135JCR Link
Citation
vol. 25, no. 2, pp. 654 - 659
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The purpose of this study was to compare the degree of microbial inactivation and cell damage induced by intense pulsed light (IPL) and short-wavelength ultraviolet (UVC) in Listeria monocytogenes and Escherichia coli O157:H7. The viability of the food-borne pathogens treated with IPL and UVC (254nm) decreased exponentially with treatment time. Particularly dramatic reductions in L. monocytogenes and E. coli O157:H7 were observed for IPL treatments at energy densities of 376 and 455W/m 2, with an approximately 7-log reduction for a treatment time of 60-180s. Also, a 4-log reduction of L. monocytogenes and a 5-log reduction of E. coli O157:H7 were achieved with UVC irradiation for 1200s. The types and amounts of IPL- and UVC-induced DNA damage in both microorganisms were determined and compared. DNAs from cells irradiated with either IPL or UVC accumulated double-strand breaks (DSBs), single-strand breaks, and cyclobutane pyrimidine dimers, and with a similar pattern; however, more DSBs were detected following UVC than following IPL in both types of microorganism. Transmission electron microscopy observations of IPL- and UVC-induced cell damage clearly indicate that bacterial cell structures were destroyed by IPL treatment but not by UVC treatment. © 2011 Elsevier Ltd.
DOI
10.1016/j.foodcont.2011.11.032
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엘텍공과대학 > 식품공학전공 > Journal papers
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