Fast-Media® Amp LB Microwaveable medium for selection of E. coli transformants Fast-Media® Amp LB formulation is a Lysogeny Broth based liquid medium supplemented with ampicillin. 1 pouch = 200 ml LB liquid medium Selective Antibiotic: Ampicillin Stability: 48h at 37°C or 4 weeks ar 4°C Sterility guaranteed