Abstract
The substance producing the controversial pink spot on paper chromatograms from urine obtained from patients with Parkinson's disease and some schizophrenics has been submitted to mass spectrographic, ultra-violet and infra-red analysis. The results of these studies would seem to suggest that the pink spot first found by Friedhoff and van Winkle consists of p-tyramine and not β-3,4-dimethoxyphenylethylamine as was previously thought.
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BOULTON, A., POLLITT, R. & MAJER, J. Identity of a Urinary “Pink Spot” in Schizophrenia and Parkinson's Disease. Nature 215, 132–134 (1967). https://doi.org/10.1038/215132a0
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DOI: https://doi.org/10.1038/215132a0
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