Why Does Milk Turn Sour and How to Prevent It?

Learn why milk turns sour, how bacteria cause spoilage, and the best ways to store milk to keep it fresh longer.

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Milk turns sour when bacteria convert lactose into lactic acid, changing the pH and resulting in an off smell and taste. This process accelerates at higher temperatures but can be slowed by refrigeration. Typically, milk sours within a few days past its expiration date if kept cold. Signs of sour milk include clumping, sour odor, and a tangy flavor. Always check the expiration date and store milk properly to extend its freshness.

FAQs & Answers

  1. What causes milk to turn sour? Milk turns sour when bacteria convert lactose into lactic acid, lowering the pH and causing an off smell and flavor.
  2. How can I tell if milk has gone sour? Signs of sour milk include clumping, a sour odor, and a tangy taste.
  3. How long does milk last before turning sour? Milk typically sours within a few days past its expiration date if it is properly refrigerated.
  4. What is the best way to store milk to keep it fresh? Keeping milk refrigerated slows bacterial growth and helps maintain freshness for longer.

Watch More

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