Abstract
To investigate in detail the “black prosthesis” syndrome, experimental production of melanin from epinephrine was performed both in bulk and onto the surface of a common prosthetic material, poly(methyl methacrylate) (PMMA). The study by ultraviolet/visible spectrometry showed that the radiation-absorptive properties of PMMA were significantly enhanced; a sample treated for 20 days in epinephrine absorbed all ultraviolet radiation up to a 344-nm wavelength and transmitted only 4.9% from the ultraviolet spectrum at 400 nm and 16.2% from the visible spectrum at 500 nm. Transmission electron microscopy studies suggest that melanogenesis occurs on the surface of PMMA, and the pigment does not penetrate the polymer. Using infrared spectrometry, it was confirmed that the pigmentation is caused by a melanin formed through the oxidative polymerization of epinephrine.
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Chirila, T.V., Cooper, h.L., Constable, I.J. et al. “Black prosthesis” revisited: a study of epinephrine-induced pigment deposits on poly(methyl methacrylate). Graefe's Arch Clin Exp Ophthalmol 229, 578–582 (1991). https://doi.org/10.1007/BF00203325
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DOI: https://doi.org/10.1007/BF00203325