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Author Topic: Do bacteria in yoghurt survive freezing?  (Read 3716 times)

Leon van der Merwe

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Do bacteria in yoghurt survive freezing?
« on: 06/09/2009 21:30:03 »
Leon van der Merwe  asked the Naked Scientists:
   
Hi Chris,
 
My boys love to eat these little tubs of Yoghurt that has been frozen - it is a good alternative for ice-cream.
 
My Question: Do these 'live cultures' that are present in yoghurt die when you freeze the yoghurt?
 
All the best and a GREAT Show!

Leon van der Merwe

What do you think?


 

Offline Nizzle

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Do bacteria in yoghurt survive freezing?
« Reply #1 on: 07/09/2009 16:04:04 »
I know that lactobacillus bulgaricus can resist frost and come to live again in your intestines.
I don't know for sure about other bacteriae.

Have a look at your boys' yoghurt and let me know what specific species of bacteria are added.. Maybe I can find something on the interweb then ;)
 

Offline Bored chemist

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Do bacteria in yoghurt survive freezing?
« Reply #2 on: 07/09/2009 19:38:04 »
Take a little of he frozen yoghurt and add it to some sterilised milk. If the milk turns to yoghurt it's reasoanvble to assume the bugs survived. Of course, you need to do this in a way that prevents other sources of contamination.
 

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Do bacteria in yoghurt survive freezing?
« Reply #2 on: 07/09/2009 19:38:04 »

 

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