Forums Assignment Help Why does milk turn sour?

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  • #720
    juwanine
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    Why does milk turn sour?

    #9283
    john Smith
    Participant

    The microbes react with milk and grow. They turn lactose into lactic acid which is sour in taste.

    #9284
    john Smith
    Participant

    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 during intense “aerobic” exercise and makes them feel like they’re burning. To produce lactic acid, the bacteria must first split lactose into its two component,simple sugars, glucose and lactose. These can diffuse into to bacterial cells and be used as energy sources. The principal protein of milk casein turns into curd in this acid environment, so another way of describing sour milk is to say it “curdled.” Both the lactose and the protein are used by the bacteria to produce additional bacterial cells. Eventually, other kinds of bacteria may grow in the milk and make protein derivatives that smell really bad; this is called “putrefaction.”

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