Selective Agents

Several different types of antibiotics serve as selective agents in selective culture media to effectively isolate, or select for, a pathogenic microogranism from food, clinical, and environmental samples. Many times, these samples may contain a pathogenic microorganism among numerous types of relatively harmless bacteria and fungi. In order to effectively isolate the pathogenic organism, antibiotic selective agents are added to culture media to hinder growth of the harmless bacteria and fungi to ensure a non-competitive environment for the pathogenic organism.

An effective selective agent should not kill, or hinder the growth of the isolated pathogen. Theoretically, any antibiotic that doesn't target the selected pathogen but kills "background" growth of harmless microorganisms would be an ideal choice for use as a selective agent. The antimicrobials listed below are the most commonly used selective agents in established selective media formulations.

Click here for a list of the most commonly screened pathogens and selective agents.
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Acriflavine hydrochloride packaged and labeled in glass bottle.
Acriflavine HCl is a type of dye commonly used as a topical antiseptic for skin infections. Acriflavine is freely soluble...
Amphotericin B, EP packaged and labeled.
Amphotericin B, EP is a polyene antifungal or antimycotic compound derived from Streptomyces nodosus. 
D-Cycloserine packaged and labeled.
D-cycloserine is an amino acid analog antibiotic. D-cycloserine acts as a competitive inhibitor of D-alanine...
Irgasan (Triclosan) packaged and labeled.
Irgasan (or triclosan) is a broad spectrum anti-fungal and antibiotic. Irgasan is slightly soluble in water and freely soluble...
Amphotericin B, solubilized packaged and labeled in glass bottle.
Amphotericin B, Solublized is a solubilized form of Amphotericin B.
Cycloheximide packaged and labeled.
Cycloheximide is a protein synthesis inhibitor in eukaryotic cells.
Tetracycline, USP packaged and labeled.
Tetracycline is a bacteriostatic polyketide antibiotic. Tetracycline HCl inhibits protein synthesis by preventing amino-acyl tRNA...
Amphotericin B, USP packaged and labeled in glass bottle.
Amphotericin B, USP is a polyene antifungal/antimycotic compound derived from Streptomyces nodosus.
Streptomycin sulfate packaged and labeled.
Streptomycin sulfate is an aminoglycoside used alone or in combination with penicillin in cell culture to...
Kanamycin sulfate, USP packaged and labeled.
Kanamycin, USP is an aminoglycoside antibiotic often used to select for bacteria which have been successfully...
Kanamycin acid sulfate packaged and labeled.
Kanamycin is an aminoglycoside antibiotic often used to select for bacteria which have been successfully...
Bacitracin packaged and labeled.
Bacitracin is a mixture of various related polypeptide antibiotic compounds derived from the bacterium, Bacillus subtilis.
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