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How does milk turn sour?

In: Food & Cooking, Biology, Chemistry [Edit categories]

Answer:

The more common reason is bacteria in the milk produce lactic acid waste product. Lactic acid is sour. The lumpiness is the result of the lower pH from the lactic acid making casien (a milk protein) precipitate.

First answer by Curryboy12345. Last edit by TheMachine1. Contributor trust: 17 [recommend contributor ]. Question popularity: 1 [recommend question].

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Relevant answers:

Why milk turn sour?
Milk bacteria use lactose as an energy source, they change it into lactic acid, which makes the milk taste sour. For what it's worth, lactic acid is the same substance that accumulates in our muscles...
When milk turns sour is that a chemical change?
Yes.
Can sour cream turn sour?
Sour cream is produced by fermentation and the "sour" applies to its taste. It can "go sour" (spoil or go bad), which is a different situation.
Why does milk sour?
Milk sours because of the acid inside of it. No, pasturized milk does not sour as fast becasue of the bacterium that went away in the process of pasturization.
What is correct The sour milk stunksOR The sour milk stanks?
the sour milk stinks