Sanitizer efficacy in preventing cross-contamination of heads of lettuce during retail crisping

Yangjin Jung, Hyein Jang, Mengqi Guo, Jingwen Gao, Karl R. Matthews

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

This study was conducted to provide information regarding mitigation of cross-contamination through the use of sanitizer during crisping at retail outlets. Seven non-inoculated heads and one inoculated head (≈5 log CFU/g) of lettuce were placed into commercial sink filled with 76 L of tap water (TW), electrolyzed water (EW, free chlorine: 43 ± 6 ppm), lactic acid and phosphoric acid-based sanitizer (LPA, pH 2.89), or citric acid-based sanitizer (CA, pH 2.78) and soaked for 5 min. Two subsequent batches (eight non-inoculated heads per batch) were soaked in the same solution. Soaking with EW significantly reduced the population of S. enterica (2.8 ± 1.5 log CFU/g), E. coli O157:H7 (3.4 ± 1.1 log CFU/g), and L. monocytogenes (2.6 ± 0.7 log CFU/g) inoculated on Romaine lettuce compared to TW, LPA, and CA (p < 0.05). On Red leaf lettuce, EW significantly reduced populations of S. enterica and E. coli O157:H7, but not L. monocytogenes compared to other treatments. No significant difference was noted between TW, LPA, and CA in reducing foodborne pathogens (p > 0.05) or preventing cross-contamination. Soaking with EW prevented cross-contamination among lettuce heads and controlled bacterial populations in crisping water for three consecutive batches. EW may be an effective option as a sanitizer to minimizing the cross-contamination of leafy greens during the retail crisping.

Original languageEnglish (US)
Pages (from-to)179-185
Number of pages7
JournalFood Microbiology
Volume64
DOIs
StatePublished - Jun 1 2017

All Science Journal Classification (ASJC) codes

  • Food Science
  • Microbiology

Keywords

  • Crisping
  • Cross-contamination
  • Electrolyzed water
  • Heads of lettuce
  • Retail settings
  • Sanitizers

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