Methy red test when the result is positive and color red, what's the result chemically?
Methy red test when the result is positive and color red, what's the result chemically?
Homework Answers
Answer
When methyl red is added to MR-VP broth that has been inoculated with Escherichia coli , it stays red. This is a positive result for the MR test. When methyl red is added to MR-VP broth that has been inoculated with Enterobacter cloacae , it turns yellow. This is a negative MR result.
The development of a stable red color on the surface of the medium indicates sufficient acid production to lower the pH to 4.4 and constitutes a positive test. Because other organisms may produce smaller quantities of acid from the test substrate, an intermediate orange color between yellow and red may develop.
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Methy red test when the result is positive and color red, what's
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