Pigment Production in the Differentiation of Trichophyton mentagrophytes and Trichophyton rubrum

Bocobo, Florante C.; Benham, Rhoda W.

doi:10.2307/3755111

Cited by 20 publications

(6 citation statements)

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“…I n addition to a suitable carbon source, a suitable nitrogen source is also important. This was shown by Bocobo and Benham (1949), who reported that pigment production in T . rubrum will not take place when the nitrogen source is ammonium chloride, even if glucose is present, and also by , who showed the influence of amino acids on the pigments produced by Trichophyton m e n tagrophytes.…”

Section: Matophytes-factors Affectingmentioning

confidence: 67%

Nutritional Studies of the Dermatophytes—factors Affecting Pigment Production*

Silva

1953

Trans NY Acad Sci

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Section: Matophytes-factors Affectingmentioning

confidence: 67%

Nutritional Studies of the Dermatophytes—factors Affecting Pigment Production*

Silva

1953

Trans NY Acad Sci

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“…The shade of the colour was uniform between pH 6-5 and 8-1 and differed only in intensity. On C.D.A., Bocobo & Benham (1949) reported no pigment production at pH 4.0 and 4.5 but at levels between pH 5 and 8 pigmentation was fairly uniform (after long culture periods). They also contrasted the lack of pigmentation on this medium at low pH with the different results on S.D.A., on which colour production was not inhibited.…”

Section: Discussionmentioning

confidence: 92%

“…Identification was based on morphological characters on a variety of media and in many cases of suspected 7-. rubrum by production of pigment after prolonged cultivation on C.D.A. (Bocobo & Benham, 1949). Other named strains were kindly supplied by Miss Mary P. English and the Mycological Reference Laboratory, London School of Hygiene and Tropical Medicine.…”

Section: Methodsmentioning

confidence: 99%

“…For easy recognition of the pigment of 7-. rubrum, a nitrogen source which supports little fungal growth but at the same time does not inhibit pigment production appears to be preferable. The corn-meal dextrose agar recommended by Bocobo & Benham (1949) seems to meet these requirements and the wine-red colour produced by T. rubrum can often be utilised to differentiate this species from T. mentagrophytes. But this medium is not an absolutely reliable promoter of the red pigment.…”

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confidence: 97%

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The stimulation of pigment production byTrichophyton rubrumon a new medium

Baxter

1964

Med Mycol

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A medium containing 0.25% lab-lemco, 0.5% dextrose in 2% agar has been found to induce early development of clearly recognisable pigment by 30 strains of Trichophyton rubrum. This medium is more satisfactory than corn-meal dextrose agar for pigment production and on it growth is suitable for study of morphological and other physiological criteria in the identification of this fungus. On the medium 7-. rubrum produces all four characteristic pigments but there is stimulation of a peach-coloured fraction. Comparison with strains of 7". mentagrophytes also showed that this medium induces a reproportioning of the pigments. Pigmentation is maximal between pH 6.5 and 7'5. On this medium as also on standard media pigmentation is inhibited by 0.5% tryptose.

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“…A practical and reliable method of differentiating T. rubrum and T. mentagrophytes, var. interdigitale, is described and compared with the methods of EDGECOMBE (5) (dextrose-potato-agar medium) and of BOCOBO and BENHAM (4) (dextrose-corn flour-agar medium).…”

Section: Introductionmentioning

confidence: 99%

Liquid Sabouraud's medium for the differentiation of Trichophyton rubrum and Trichophyton mentagrophytes

Ziprkowski

Krakowski

Sommer

2009

Mycoses

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A practical and reliable method of differentiating T. rubrum and T. mentagrophytes, var. interdigitale, is described and compared with the methods of Edgecombe (5) (dextrose‐potato‐agar medium) and of Bocobo and Benham (4) (dextrose‐corn flour‐agar medium). The method is based on differences of specific density between T. rubrum and T. mentagrophytes. After incubation of 2 to 3 days in a test tube containing a 4% dextrose and 1% pepton solution (liquid Sabouraud's solution), 92.5% (211) of the 228 T. rubrum strains examined grew at the bottom of the tube while 96.5% (56) of 58 T. mentagrophytes strains developed at the surface of the solution. This represents a modification of the original method described by Götz (2) who utilized a 10% pepton water solution as selective medium. Our method has been found to be of a higher degree of reliability than that carried out by Götz and yet easy to perform and obtaining the results within 2–3 days.

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Pigment Production in the Differentiation of Trichophyton mentagrophytes and Trichophyton rubrum

Cited by 20 publications

References 0 publications

Nutritional Studies of the Dermatophytes—factors Affecting Pigment Production*

Nutritional Studies of the Dermatophytes—factors Affecting Pigment Production*

The stimulation of pigment production byTrichophyton rubrumon a new medium

Liquid Sabouraud's medium for the differentiation of Trichophyton rubrum and Trichophyton mentagrophytes

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