pH optimum for bacterial growth

K N and P J Harris ecoli at
Tue Aug 15 04:53:14 EST 1995

There are lots of buffer systems.
I would not choose a phosphate system first off as the concentrations of 
phosphate are quite high and can interfere with loads of other media 
constituents. (I once tried to buffer plate count media in the hope of 
controlling pH changes that took place once things started to grow. Net 
result - all the counts went down !). try to get hold of a good book on 
media or failing that the list produced in the Documenta Geigy series. 
Then make sure that your bugs are not allergic to the buffer 
Peter Harris, Soil Science Dept, Univ of Reading, UK.

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