Hi everybody,

We need to use a lot of LB with Ampicillin to culture transformed E. Coli bacteria. We often spare LB + Amp and keep it at 4°C, but we were wondering wether is possible to store LB + Amp at -20 to be sure that nothing can grow in the LB and the Ampicillin does not get degraded.

Is this possible? Does the ampicillin get damaged from freezing and thawing?

Thank you

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