2018/05/02 by S.H. Park, Sang-Hyun Park, W.J. Kim +3
Agricultural and Biological Sciences · Biochemistry, Genetics and Molecular Biology · Engineering · #Advanced Chemical Sensor Technologies #Food Safety and Hygiene #Listeria monocytogenes in Food Safety
paper · doi:10.1111/lam.13002
openalex publication_date 2018/05/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29
The effect of relative humidity (RH) on the antimicrobial efficacy of chlorine dioxide (ClO2) gas against foodborne pathogens on tomatoes was evaluated. Also, levels of ClO2 residues on tomatoes after exposure to ClO2 gas under different RH conditions were measured to determine the quantity of solubilized ClO2 gas on tomato surfaces. Escherichia coli O157:H7, Salmonella Typhimurium and Listeria monocytogenes were inoculated on tomatoes and exposed to ClO2 gas (5, 10, 20 and 30 ppmv) under different RH conditions (50, 70 and 90%). As ClO2 gas concentration and treatment time increased, significant differences (P < 0·05) were observed between inactivation levels under different RH conditions. Exposure to 30 ppmv of ClO2 gas (50% RH) for 20 min resulted in 1·22–1·52 log reductions of the three foodborne pathogens. Levels of the three foodborne pathogens were reduced to below the detection limit (0·48 log CFU per cm2) within 15 min when exposed to 30 ppmv of ClO2 gas at 70% RH and within 10 min at 90% RH. At a given ClO2 gas concentration, ClO2 residues on tomatoes significantly (P <0·05) increased with increasing RH, and there were close correlations between log reductions of pathogens and ClO2 residues on tomatoes. This study reported on the correlation between the amount of ClO2 residues on produce surfaces and the level of inactivation of pathogens after ClO2 gas treatment. Variations in RH have great effect on the solubilization of ClO2 gas on tomato surfaces considering that ClO2 residues on tomatoes increased with increasing RH. Also, the amount of ClO2 residues on tomatoes is positively correlated with the level of inactivation of pathogens. The results of this study provide insights for predicting inactivation patterns of foodborne pathogens by ClO2 gas for practical application by the fresh produce industry.