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Yellow E. coli colonies on MACCONKEY AGAR


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#1 somu

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Posted 26 April 2009 - 10:24 PM

helloooo

Does anyone having idea that E.coli culture can give slight yellowish colonies on Macckonkey agar . I havent seen such type of colonies in past. Presently I am trying to demonstrate purity of one of the E. coli culture. All other test like Indole test is showing E. coli , but on Macconkey few colonies are yellowish. Does anyone has idea about this. Your suggestions and observations are necessary to come out with conclusion.

Thanks

#2 GeorgeWolff

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Posted 28 April 2009 - 02:00 PM

"Few of the colonies"? So not all? You sure it's a pure culture?

#3 Tanja N

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Posted 15 May 2009 - 05:24 AM

Our experience is that E.coli DH5α and NM522 cells are yellowish on MACCONKEY agar.

Regards,
T :)




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