title: Inactivation kinetics of Listeria monocytogenes and Salmonella enterica serovar Typhimurium on fresh-cut bell pepper treated with slightly acidic electrolyzed water combined with ultrasound and mild heat.
abstract: The goal of this study was to enhance the antimicrobial effect of slightly acidic electrolyzed water (SAEW) through addition of synergistic treatment with ultrasound (US) and mild heat treatment in order to improve the microbial safety of fresh-cut bell pepper. To evaluate the synergistic effects, the Weibull model was used to mathematically measure the effectiveness of the individual and combined treatments against Listeria monocytogenes and Salmonella Typhimurium on the pepper. The combined treatment (SAEW+US+60 °C) resulted in the TR values of 0.04 and 0.09 min for L. monocytogenes and S. Typhimurium, respectively, as consequence of the minimum value. Subsequently, texture analysis was carried out to test the potential effect on quality of the samples due to the involved mild heat and ultrasound treatment. When compared to the control, there was no significant change (p ≥ 0.05) in the texture (color and hardness) of the samples that were treated by 1 min of the combined treatment (SAEW+US+60 °C) during storage at 4 °C for 7 days. This combined treatment achieved approximately 3.0 log CFU/g reduction in the two pathogens. The results demonstrate that the involved hurdle factors which are ultrasound and mild heat achieved the synergistic effect of SAEW against the two pathogens. According to the results of texture analysis, 1 min of SAEW+US+60 °C is the optimal condition due to without negative influence on the quality of the samples during the storage. The optimal condition shows the enhanced antimicrobial effect of SAEW and enables to improve microbial safety of fresh bell pepper in food industry as a consequence of hurdle approach.
authors.affiliation: Department of Food Science and Biotechnology and Institute of Bioscience and Biotechnology, Kangwon National University, Chuncheon, Gangwon 200-701, Republic of Korea.
authors.forename: Ke
authors.initials: K
authors.lastname: Luo
authors.affiliation: Department of Food Science and Biotechnology and Institute of Bioscience and Biotechnology, Kangwon National University, Chuncheon, Gangwon 200-701, Republic of Korea. Electronic address: deoghwa@kangwon.ac.kr.
authors.forename: Deog-Hwan
authors.initials: DH
authors.lastname: Oh
mesh_terms: D000143:Acids / Q000494:pharmacology*; D002212:Capsicum / Q000382:microbiology*; D015169:Colony Count, Microbial; D005519:Food Preservation / Q000379:methods*; D005638:Fruit / Q000382:microbiology; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008089:Listeria monocytogenes / Q000737:chemistry / Q000187:drug effects / Q000254:growth & development* / Q000528:radiation effects; D012486:Salmonella typhimurium / Q000737:chemistry / Q000187:drug effects / Q000254:growth & development* / Q000528:radiation effects; D014465:Ultrasonics
chemical_list: D000143:Acids
keywords: Fresh-cut bell pepper; Hurdle technology; Slightly acidic electrolyzed water; Ultrasound; Weibull model