Summary
1. On the basis of their IR and UV spectra and also a positive test with Ehrlich's reagent the brown and black pigments can be assigned to the melanins of the hydroxyindole type.
2. In the development process of the culture, the pigment undergoes a series of quantitative changes: the relative amount of protein decreases, the sample becomes nonhomogeneous, and colored products apparently of radical nature appear in the polymer.
3. As the culture ages, the structure and state of the melanin molecule change.
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Additional information
Institute of Pharmaceutical Chemistry, Leningrad. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 254–261, March–April, 1977.
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Tarasov, B.P., Yurlova, N.A. & Elinov, N.P. Melanins formed by a culture of Aureobasidium (Pullularia) pullulans Arnaud (de Bary), 1910. Chem Nat Compd 13, 216–221 (1977). https://doi.org/10.1007/BF00563952
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DOI: https://doi.org/10.1007/BF00563952