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How could these byproducts affect phenol red (a pH indicator), and subsequently make a media selective/differential?...

How could these byproducts affect phenol red (a pH indicator), and subsequently make a media selective/differential? (for bacteria /microbes).

How phenol red work in a media ?

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Answer #1

A solution of phenol red will have a yellow color at acidic pH and  a red color at alkaline pH.
Mannitol Salt Agar (MSA) - selective and differential for Staphylococcus aureus.  Staphylococcus aureus grows in Mannitol Salt Agar, ferments Mannitol and produces acid yellow colonies.

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