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Isolation and Characterization of Melanin from a Marine Fungus

An alkali extraction procedure yielded a dark brown pigment from the vegetative hyphae of the mangrove fungus, Cirrenalia pygmea. This pigment responded positively for all the diagnostic tests for melanin. The absorption spectrum of the pigment showed a strong absorption in the UV region with no absorption peaks in the visible region of the spectrum. A plot of log absorbance versus wavelength gave a linear curve with negative slope. The IR spectrum showed characteristic absorption bands. When tricyclazole, a specific inhibitor of dihydroxynaphthalene (DHN) type of melanin was incorporated in the growth medium, the fungus produced light coloured hyphae which were highly susceptible to osmotic shock. It appears that melanization of hyphae may afford protection to some marine fungi against sudden changes in osmotic pressure.