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Melanins are naturally occurring macromolecules whose structural complexity appeared evident from the first researches of Quilico. Their structural characterization remains a difficult problem,(More)
The direct determination of 2-(2-furoyl)-4(5)-(2-furanyl)-1H-imidazole (FFI), present in the acid hydrolysis products of B-poly(L-lysine) and B-albumin and which appears to be a key intermediate in(More)
The structural investigation of four bio- and synthetic melanins, obtained by the action of polyphenol oxidase from potatoes and Psalliota campestris mushrooms and of tyrosinase from Sepia(More)