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Antimicrobial Performance of Alkaline Ionic Fluid (GC-100X) and Its Ability To Remove Escherichia coli O157:H7 from the Surface of Tomatoes

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An efficacy test of GC-100X, a noncorrosive alkaline ionic fluid (pH 12) composed of free radicals and supplemented with xylitol, was carried out against six major foodborne pathogens—Staphylococcus aureus FRI 913, Salmonella enterica serovar Enteritidis ATCC 13076, S. enterica serovar Typhimurium DT104 Korean isolate, Vibrio parahaemolyticus ATCC 17803, Escherichia coli O157:H7 ATCC 43894, and Pseudomonas aeruginosa KCTC 1637—at three different temperatures (4, 25, and 36°C) with or without organic load (2% yeast extract). Results revealed a more than 4-log10 (CFU/ml) reduction (1.0 × 104 CFU/ml reduction) against all pathogens reacted at 37°C for 3 h in the absence of organic material. GC-100X solution diluted with an equal volume of distilled or standard hard water (300 ppm CaCO3) showed effective bactericidal activity, particularly against gram-negative bacteria. Washing efficacy of GC-100X solution was compared against E. coli O157:H7 on cherry tomato surfaces with those of a commercially used detergent and chlorine water (100 ppm). Viable cell counts of E. coli O157:H7 that had penetrated to the cores of tomatoes after sanitizing treatment revealed that GC-100X stock and its 5% diluted solutions had similar washing effects to 100-ppm chlorine water and were more effective than the other kitchen detergent. These results indicate that GC-100X has good bactericidal and sanitizing activities and is useful as a new sanitizer for food safety and kitchen hygiene.


Document Type: Research Article

Affiliations: 1: Department of Microbiology, College of Veterinary Medicine and School of Agricultural Biotechnology, Seoul National University, Shilim 9-Dong, Kwanak-Gu, Seoul, 151-742, Korea 2: Department of Microbiology, College of Veterinary Medicine and School of Agricultural Biotechnology, Seoul National University, Shilim 9-Dong, Kwanak-Gu, Seoul, 151-742, Korea 3: Buhmwoo Institute of Technology Research, 630, Seonggok-Dong, Ansan, Gyounggi, 425-833, Korea

Publication date: September 1, 2003

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