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Strawberry fruit were inoculated with the human pathogen  E. coli  O157:H7, and the bacteria were recovered from the fruit over a 3-day period of storage at room temperature. The bacterial population was maintained on fruit when the inoculation level was relatively high and increased when the inoculation level was low. The volatile metabolites of  E. coli  O157:H7 growing on plate count agar (PCA) and on inoculated strawberry fruit were collected by a headspace trapping system and analyzed by gas chromatography and GC-mass spectrometry.  E. coli  O157:H7 grown on PCA produced a variety of volatile compounds including indole as a major component and a series of methyl ketones. A nonpathogenic  E. coli  also produced these compounds. However, there was not an appreciable amount of indole collected from  E. coli  O157:H7 inoculated strawberry fruit as compared to the large amount of volatiles produced by the fruit. Strawberry fruit were able to capture over 95% of the vapor phase indole fed to them from a neat source.

386 Volatiles of E. coli O157:H7 and Foodborne Pathogen Detection on Strawberry Fruit