question to penicillin amidase stability

Gernot T. John g.john at
Tue Mar 9 09:01:58 EST 1999

My first message was bounced. I don't know why. and again...


today we discovered an old solution of penicillin-amidase from E.coli
(EC in our fridge. It was stored there for about 4 months at
-4°C. (I don't know who put it there!!!) At this temperature it is
liquid. The supplier specifies that the enzyme is to stored below -18°C,

where the solution is freezed.
Does anybody know whether this solution is still OK?


g.john at

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