Various people in our lab will prepare a liter or so of LB, add kanamycin to 25-37 mg/L for selection, and store it at 4 °C for minipreps or other small cultures (where dosing straight LB with a 1000X stock is troublesome). Some think using it after more than a week is dubious, but we routinely use kan plates that are 1-2 months old with no ill effect.
How long can LB with antibiotic such as kanamycin, chloramphenicol, or ampicillin be stored at 4 °C and maintain selection?
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