A direct plate count method for detecting E. coli in frozen food by detecting indole in colonies |
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Authors: | L.P. Hall |
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Affiliation: | Campden Food Preservation Research Association, Chipping Campden, Glos. GL55 6LD, UK |
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Abstract: | A medium giving maximum indole production colonies of Escherichia coli has been defined and includes diethylaminoethylcellulose which restricts the spread of indole through the agar medium. A reagent based on p-dimethylaminocinnamaldehyde has been developed to give optimum indication of indole production. A simple method which will identify E. coli in cultures obtained from selective media is described and an extension, including a resuscitation stage, devised for rapid and direct quantitation of E. coli from frozen foods. |
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