why does milk go sour?

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why does milk go sour?

2006-11-25 12:43:55 · 4 answers · asked by D H 1 in Food & Drink ➔ Non-Alcoholic Drinks

4 answers

The bacteria feed on the sugar in the milk ( lactose ) and produce lactic acid. This gives the milk its sour tart taste.

2006-11-25 12:46:46 · answer #1 · answered by Austin Semiconductor 5 · 0⤊ 0⤋

the air causes lactic acid to break down in the milk which makes it sour. there is also an enzyme called renin that is released which causes to milk to curdle

2006-11-25 12:48:55 · answer #2 · answered by ladibelle2005 2 · 0⤊ 0⤋

because it has a bacteria that all dairy products have n when they die, they spoil.

2006-11-25 13:22:54 · answer #3 · answered by Anonymous · 0⤊ 0⤋

bcuz its expiration...

2006-11-25 15:22:31 · answer #4 · answered by kaRizzlyn 2 · 0⤊ 0⤋