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If i did a lab using phenol red testing of fructose,

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If i did a lab using phenol red testing for fermentation of fructose, glucose, and mannitol. And i tested staph epidermidis ans s cerevisiae. What would be the fermentation profile of each. And what color would the tubes be showing those results
Submitted: 1 year ago.
Category: General
Expert:  JACUSTOMER-lesqa7tl- replied 1 year ago.
Staphylococcus epidermidis is reported as fermenting:
Glucose Positive, Fructose Positive and Mannitol Negative
Saccharomyces cerevisiae is Glucose Positive, Fructose Positive and Mannitol Negative (although some rare strains can ferment Mannitol, so you need to actually test your bug to see if it is one of those strains)
Fermentation produces acid which turns the phenol red yellow (acid production) which is the positive reaction.
Fermentation of Mannitol is a key test for separating Staphylococcus epidermidis from the pathogenic Staphylococcus aureus (Mannitol pos)