Description
Cloxacillin sodium is a semi synthetic, penicillinase resistant beta lactam antibiotic commonly used as a selective agent and for studying bacterial cell wall synthesis.
As an isoxazolyl penicillin, cloxacillin binds to penicillin binding proteins and inhibits peptidoglycan cross-linking, resulting in impaired cell wall formation and lysis of susceptible bacteria. Its resistance to degradation by many beta lactamases makes it particularly useful in studies involving penicillin resistant Staphylococcus species and other Gram-positive organisms.
In research, cloxacillin sodium is incorporated into culture media to provide defined selective pressure, support resistance mechanism studies, and enable controlled microbial growth conditions.
Key Features and Advantages
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Penicillinase Resistant Structure: Maintains activity against many beta lactamase producing Gram positive bacteria, making it valuable for resistance and selection studies.
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Beta Lactam Mode of Action: Targets penicillin binding proteins and disrupts bacterial cell wall synthesis, a well characterized and widely studied antimicrobial mechanism.
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Selective Activity Against Gram-Positive Bacteria: Particularly effective against Staphylococcus species, supporting targeted microbiological applications.
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Water Soluble Sodium Salt: Easily dissolved in aqueous solutions for preparation of sterile stock solutions and antibiotic supplemented media.
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Established Research Utility: Frequently used in studies of antibiotic resistance, cell wall biogenesis, and microbial physiology.
Common Applications and Usage Notes
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Selective Media Formulation: Added to agar or broth to suppress susceptible Gram positive bacteria while allowing growth of resistant strains.
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Beta Lactamase and Resistance Research: Used to investigate penicillinase activity, resistance gene expression, and mutation frequency in bacterial populations.
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Cell Wall Synthesis Studies: Applied in experiments examining peptidoglycan assembly, stress responses, and lytic processes.
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Microbial Genetics Experiments: Provides defined antibiotic pressure in studies involving resistant laboratory strains.
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Contamination Suppression in Culture: Supports maintenance of selective conditions when working with mixed or environmental samples.
Practical Tips
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Stock Preparation: Dissolve in sterile water to prepare concentrated stock solutions and filter sterilize before use in culture media.
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Storage Recommendations: Store powder in a dry environment at recommended temperatures. Aliquot prepared solutions to minimize repeated freeze thaw cycles.
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Strain Specific Optimization: Determine minimum inhibitory concentrations for your specific bacterial strain, as susceptibility varies among isolates.
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Stability Considerations: Avoid prolonged exposure of prepared media to elevated temperatures, as beta lactam antibiotics can degrade over time.
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Include Appropriate Controls: When studying resistance mechanisms, always include susceptible reference strains to confirm antibiotic activity.
