Summary
SeveralPhycomycetes andAscomycetes form a reddish-brown pigment if their nutrient medium contains tryptophan. The pigment can be extracted from the medium withn-butanol, cyclohexanol, and a mixture of phenol and chloroform 1∶1 (w/v).
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Thöni, H. Die Bildung eines rotbraunen Pigmentes durch Mikroorganismen bei Anwesenheit von Tryptophan in der Nährlösung. Experientia 22, 376 (1966). https://doi.org/10.1007/BF01901144
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DOI: https://doi.org/10.1007/BF01901144