Starter cultures - pH minimum Streptococcus thermophilus

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pH minimum Streptococcus thermophilus

Printed From: Dairy Science and Food Technology
Category: Starter cultures
Forum Name: Starter cultures
Forum Description: Discussion about the microorganisms used in the manufacture of cultured products
URL: https://www.dairyscience.info/forum/forum_posts.asp?TID=385
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Topic: pH minimum Streptococcus thermophilus

Posted By: micro
Subject: pH minimum Streptococcus thermophilus
Date Posted: 05 Jun 2014 at 5:58pm

Hi all!

I would like to know if ST can tolerate pH <= 3.8 and even grow.

Any help?

Literature are welcome. :)

Thanks

Replies:

Posted By: formula123
Date Posted: 04 Jun 2016 at 9:49pm

Apologies for delay in approving post. Found it prior to deleting many months of SPAM.

You probably have the answer by now?

Some strains of Streptococcus thermophilus can exhibit slow growth down to about pH 4.2. This is probably the limit. Other strains can grow to about pH 4.4.

Loss of viability would be expected as time at pH 3.8 is increased.