• Ampicillin/sulbactam (2:1) packaged and labeled.

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SKU: A071

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Ampicillin/Sulbactam is a combination of a β-lactam similar in structure to penicillin, with a β-lactamase inhibitor used to increase potency of β-lactam antibiotics.

TOKU-E offers five forms of Ampicillin:

 It is used for microbiological in vitro susceptibility tests, and studies in pharmacokinetics and pharmacodynamics.

    CAS Number


    Molecular Formula

    Ampicillin: C16H19N3O4S
    Sulbactam: C8H11NO5S

    Molecular Weight


    Mechanism of Action

    Like all β-lactams, Ampicillin interferes with PBP (penicillin binding protein) activity otherwise involved in the final phase of peptidoglycan synthesis. PBP’s are enzymes which catalyze a pentaglycine crosslink between alanine and lysine residues. Without a pentaglycine crosslink, the integrity of the cell wall is severely compromised ultimately leading to cell lysis.

    Tariff Code



    Ampicillin targets Gram-negative non ESBL (Extended Spectrum β-lactamase) bacteria including Staphylococcus and Streptococcus and medically important enteric pathogens such as Shigella and Salmonella. Ampicillin has been found to be effective against certain β-lactam sensitive VRE or vancomycin resistant Enterococcus; a glycopeptide antibiotic resistant "superbug."


    Eukaryotic Cell Culture Applications

    Ampicillin is routinely used to select for cells containing the pcDNA3.1 and pEAK10 resistance plasmids in cell line A904L at an effective concentration of 50 µg/mL. For additional information, please visit our cell-culture database.

    Microbiology Applications

    Ampicillin/Sulbactam is commonly used in clinical in vitro microbiological antimicrobial susceptibility tests (panels, discs, and MIC strips) against Gram-positive and Gram-negative microbial isolates. Medical microbiologists use AST results to recommend antibiotic treatment options for infected patients.

    Media Supplements

    Ampicillin can be used as a selective agent in several types of isolation media:

    Aeromonas Medium Base - Ampicillin Selective Supplement





    White or almost white crystalline powder

    Water Content (Karl Fischer)





    Ampicillin: ≥563 μg/mg
    Sulbactam: ≥280 μg/mg


    Dichloromethane: ≤0.06%
    Acetone: ≤0.5%
    Ethanol: ≤0.5%
    Ethyl acetate: ≤0.5%


    <0.17 EU/mg



    Pitout JD, Sanders CC, Sanders WE (1997) Antimicrobial resistance with focus on beta-lactam resistance in Gram-negative bacilli. Am. J. Med 103(1):51-59 PMID 9236486

    Waxman DJ and Strominger JL (1983) Penicillin-binding proteins and the mechanism of action of beta-lactam antibiotics. Ann. Rev. Biochem 52:825-869 PMID 6351730

    Yang W, Zhang L, Lu Z, Tao W, Zhai Z (2001) A new method for protein coexpression in Escherichia coli using two incompatible plasmids. Protein. Expr. Purif. 22(3):472-478 PMID 11483011

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