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

Chan Ick Cheigh, Mi Hyun Park, Myong Soo Chung, Jung Kue Shin, Young Seo Park

Research output: Contribution to journalArticlepeer-review

83 Scopus citations

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.

Original languageEnglish
Pages (from-to)654-659
Number of pages6
JournalFood Control
Volume25
Issue number2
DOIs
StatePublished - Jun 2012

Keywords

  • Cell damage
  • Escherichia coli O157:H7
  • Intense pulsed light (IPL)
  • Listeria monocytogenes
  • UVC

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