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You are here:Home » Culture Media » Media-Microbiological » Dermatophyte Test Medium (DTM Test Agar) (Powder)

Dermatophyte Test Medium (DTM Test Agar) (Powder)


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Dermatophyte Test Medium is used for the selective isolation of dermatophyic fungi.
Catalog #D3212
In 1969, Taplin, et al. developed Dermatophyte Test Medium for the isolation and recognition of dermatophytic fungi, the causative gent of ringworm from hair, nails and skin. Dermatophyte Test Medium is preferred for isolation and early recognition of Microsporum, Trichophyton and Epidermophyton genera because of a distinct color change in the medium. Rapidly growing species may produce a complete color change in the medium in three days. The slower growing species will change the indicator in longer time periods. Other organisms may grow. These can be recognizes as nondermatophytes by lack of color change. A few organisms, including saprophytes, yeasts and bacteria are capable of changing the medium from red to yellow. These are easily recognzied by their distinctive colonial morphology.
Soy Peptone provides nitrogen and vitamins required for organism growth. Dextrose is included as an energy source. Phenol Red is the pH indicator used to detect acid production. Cycloheximide inhibits most saprophytic molds. The supplements, Gentamicin and Chlortetracycline, aid in selectivity of Dermatophyte Test Medium. Gentamicin inhibits gram-negative bacteria including Pseudomonas spp.. Chlortetracycline is a broad-spectrum antibiotic, inhibiting a wide range of gram-positive and gram-negative bacteria. Agar is the solidifying agent.
AppearanceOff-white to beige, homogeneous, free flowing powder.
SolubilityYellow-orange, clear, complete.
pHAs Reported
Important NoteThis product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications without the expressed written authorization of United States Biological.
Alternate namesDTM Agar: Agar, Soy Peptone, Dextrose, Cycloheximide, Phenol Red, Gentamicin Sulfate, Chlortetracycline

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