Abstract
l-epinephrine, adrenochrome and adrenolutin after incubation in human blood plasmas at 37 ° for 24 hours produce very similar plasma-soluble compounds which have the same brown color, the same odor, the same yellow-green fluorescence in ultraviolet light and very similar excitation maxima of approximately 340 mμ, 404 mμ and fluorescence maxima of approximately 482 mμ. They also have the same or similar ultraviolet and visible spectra with absorption maxima of approximately 280 mμ and virtually the same paper chromatograms with R F value of approximately 0.78 in a solvent system of 5% MeOH-95% water. These compounds have been given the name “rheomelanins” because they are plasma-soluble and brown in color. The results of the present studies indicate that the indole pathways of epinephrine metabolism are available in man.
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