• Methicillin sodium packaged and labeled.

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SKU: M029

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Description

Methicillin sodium is a narrow spectrum β-lactam antibiotic in the penicillin family and is soluble in aqueous solution (0.3 mg/mL).

    CAS Number

    132-92-3

    Molecular Formula

    C17H19N2NaO6S

    Molecular Weight

    402.40

    Mechanism of Action

    β-lactams interfere with PBP (penicillin binding protein) activity involved in the final phase of peptidoglycan synthesis. PBP’s are enzymes which catalyze a pentaglycine crosslink between alanine and lysine residues providing additional strength to the cell wall. Without a pentaglycine crosslink, the integrity of the cell wall is severely compromised and ultimately leads to cell lysis and death. Resistance to β-lactams is commonly due to cells containing plasmid encoded β-lactamases. Methicillin is mostly resistant to β-lactamases.

    Storage Conditions

    -20°C

    Tariff Code

    2941.10.5000

    Spectrum

    Methicillin targets primarily the cell wall of Gram positive organisms especially Staphylococcus aureus.

Applications

    Microbiology Applications

    Because of its widespread resistance among medically significant microbes, methicillin may be used as a selective agent in pathogen isolation media to inhibit insignificant microbial background growth. Additionally, methicillin sodium is commonly used in clinical in vitro microbiological antimicrobial susceptibility tests (panels, discs, and MIC strips) against gram positive microbial isolates. Methicillin is particularly used to test MRSA (Methicillin-resistant Staphylococcus aureus). Medical microbiologists use AST results to recommend antibiotic treatment options for infected patients. Representative MIC values include:

    • Staphylococcus aureus 0.5 µg/mL - 32 µg/mL
    • For a complete list of methicillin MIC values, click here.

Specifications

    Form

    Powder

    Appearance

    White or almost white powder

    Source

    Semi-synthetic

    Water Content (Karl Fisher)

    ≤10.0%

    Melting Point

    196-197°C (dec.)

    Optical Rotation

    +225°

    Assay

    ≥90.0%

References

    References

    Guzmán, Flavio, MD. "Beta Lactams Antibiotics (penicillins and Cephalosporins) Mechanism of Action.” Medical Pharmacology. Pharmacology Corner, 29 Nov. 2008. Web. 21 Aug. 2012.

    Pitout JD, Sanders CC, Sanders WE Jr. Antimicrobial resistance with focus on beta-lactam resistance in gram-negative bacilli. Am J Med 1997; 103:51.

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