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Identification of electron beam-resistant bacteria in the microbial reduction of dried laver (Porphyra tenera) subjected to electron beam treatment
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  • Journal title : Korean Journal of Food Preservation
  • Volume 23, Issue 1,  2016, pp.139-143
  • Publisher : The Korean Society of Food Preservation
  • DOI : 10.11002/kjfp.2016.23.1.139
 Title & Authors
Identification of electron beam-resistant bacteria in the microbial reduction of dried laver (Porphyra tenera) subjected to electron beam treatment
Kim, You Jin; Oh, Hui Su; Kim, Min Ji; Kim, Jeong Hoon; Goh, Jae Baek; Choi, In Young; Park, Mi-Kyung;
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This study investigated the effect of electron beam (EB) treatment on the microbial reduction of dried laver (Porphyra tenera) and identified EB-resistant bacteria from the treated dried laver. After EB treatments of 4 kGy and 7 kGy, the numbers of total bacteria and EB-resistant bacteria were measured using tryptic soy agar and mannitol salt agar, respectively. The morphological and biochemical characteristics of each isolated EB-resistant bacteria were investigated and these bacteria were identified. Compared to the control (, the total bacterial number was significantly decreased to ( and ( after EB treatments of 4 kGy and 7 kGy, respectively. With a higher EB dosage, the number of red colonies was almost same, whereas the number of yellow colonies was significantly decreased to ( and 0 CFU/g for 4 kGy and 7 kGy, respectively. All red and yellow colonies were gram-positive cocci, catalase-positive, and resistant to 3% and 5% NaCl media. From the 16S rDNA sequence analysis, yellow and red colonies were identified as either Micrococcus flavus or M. luteus, with 99% similarity for the yellow colonies, and Deinococcus proteolyticus and D. piscis, with 99% and 97% similarity for the red colonies, respectively.
dried laver;electron beam;resistant bacteria;identification;
 Cited by
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