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  • Title: Reduction of an Escherichia coli K12 Population by Bdellovibrio bacteriovorus Under Various In Vitro Conditions of Parasite:Host Ratio, Temperature, or pH.
    Author: Jackson L, Whiting RC.
    Journal: J Food Prot; 1992 Nov; 55(11):859-861. PubMed ID: 31084062.
    Abstract:
    Intrinsic and extrinsic parameters of food products, as well as bacterial population, were evaluated for their effects on the ability of Bdellovibrio bacteriovorus , a bacterium parasitic upon gram-negative bacteria, to reduce an Escherichia coli population. High concentrations of both parasite and host were the most effective for reducing a specified E. coli population. B. bacteriovorus was able to reduce the E. coli count by 90% (1 log) in < 1 h at ratios of 5:1, 10:1, and 30:1 (parasite:host). Temperatures between 20 and 30°C were more conducive to bdellovibrio attack than temperatures less than 20°C. E. coli populations were reduced by more than 7-log values after 7 h of incubation at 30°C with parasite:host ratios of 2:1, 5:1, and 10:1. Greater than a 5-log reduction in the E. coli population was observed at the ratio of 30:1. B. bacteriovorus reduced the E. coli population by 1 log in approximately 24 min and 20 min at pH 7.2 and 6.8, respectively. At pH values <6.8, the activity of B. bacteriovorus was diminished. These results define some of the conditions where the application of B. bacteriovorus may aid in the reduction/elimination of some gram-negative pathogens and spoilage flora that may be present in foods.
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