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Genotyping Based on Polymerase Chain Reaction of Enterobacter sakazakii Isolates from Powdered Infant Foods  

Choi, Suk-Ho (Division of Animal Resources and Life Science, Sangji University)
Choi, Jae-Won (Division of Animal Resources and Life Science, Sangji University)
Lee, Seung-Bae (Division of Animal Resources and Life Science, Sangji University)
Publication Information
Food Science and Biotechnology / v.17, no.6, 2008 , pp. 1171-1177 More about this Journal
Abstract
This study was undertaken to classify Enterobacter sakazakii isolates from 13 powdered infant formula products, 25 powdered weaning diet products, and 33 weaning diet ingredients on polymerse chain reaction (PCR) methods. The numbers of the isolates from 1 powdered infant formula product, 7 powdered weaning diet products, and 6 weaning diet ingredients were 1, 14, and 8, respectively. The contaminated ingredients were 1 rice powder, 2 millet powders, 2 vegetable powders, and 1 fruit and vegetable premix. PCR with the primer of repetitive extragenic palindromic element (REP-PCR) and random amplification of polymorphic DNA(RAPD) were effective in discriminating among the isolates, but tRNA-PCR and PCR with the primer of l6S-23S internal transcribed spacer (ITS-PCR) were not. Some of E. sakazakii isolates from vegetable powders, fruit and vegetable premix, and millets powders were classified into the clonal groups based on the DNA patterns in the REP-PCR and RAPD analysis. A close genetic relationship among the isolates from some of the powdered weaning diet products and the rice powder was also detected in the cluster analysis based on the DNA patterns in RAPD.
Keywords
Enterobacter sakazakii; infant formula; weaning diet; polymerase chain reaction (PCR);
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
Times Cited By Web Of Science : 1  (Related Records In Web of Science)
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