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Efficacy of FIT Produce Wash and Chlorine Dioxide on Pathogen Control in Fresh Potatoes
Author(s) -
Park E.J.,
Gray P.M.,
Oh S.W.,
Kronenberg J.,
Kang D.H.
Publication year - 2008
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1750-3841.2008.00793.x
Subject(s) - flume , microorganism , chemistry , chlorine , carbon dioxide , food science , environmental engineering , environmental science , bacteria , biology , mathematics , flow (mathematics) , geometry , organic chemistry , genetics
A commercial fresh pack potato operation was used as a model to evaluate FIT fruit and vegetable wash effectiveness in reducing levels of microorganisms on potatoes and in flume water. Fresh potatoes were washed in flume water with or without FIT, or treated with a spray bar utilizing either FIT, 9 ppm chlorine dioxide (ClO 2 ), or a water control. Both flume treatments were also evaluated for APC and Gram‐negatives. There were no significant differences in reduction of these microorganisms on treated or control potatoes. However, levels of Gram‐negative bacteria in FIT‐amended flume water were reduced by 5.95 log CFU/g, and the APC was reduced by 1.43 log CFU/g. To validate plant trial findings, this test was repeated using solutions of sterile potato flume water from the fresh pack operation, containing a typical level of dissolved and suspended solids. Treatment solutions prepared with flume water or deionized water containing FIT, 9 ppm ClO 2 , or a water control were inoculated with E. coli O157:H7, Salmonella Typhimurium, or Pectobacterium carotovorum ssp. carotovorum . FIT and ClO 2 prepared with deionized water reduced levels of microorganisms by >6.1 to 6.6 log CFU/g to below the detection limit. FIT prepared with flume water reduced levels of all organisms by >6.0 to 6.4 log CFU/g to below the detection limit, whereas ClO 2 prepared from flume water reduced bacterial levels of all organisms by only 0.7 to 1.4 log CFU/g. Neither FIT nor ClO 2 was particularly efficacious against E. coli O157:H7, S. Typhimurium, APC, yeasts, or molds on potato surfaces.