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What is the optimal ph for production of penicillin?

some books say a neutral ph of around 7 to 7.5 ,but some sat its around 5 to 6.5.

can someone clarify ?
Its between 6.5 and 7.5, outside this results in poor culture performance.
(11-21-2013, 03:48 AM)Jessica Wrote: [ -> ]Its between 6.5 and 7.5, outside this results in poor culture performance.

okay thanks!
but then if i have options in a question which asks me to mark one of these,which one should i mark
1)6.0
2)7.0
3)9.0
4)4.0
My choice would be ph 7.0.
(11-21-2013, 08:05 PM)Jessica Wrote: [ -> ]My choice would be ph 7.0.

thankyou!