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- W2058564568 abstract "IT HAS been known for many years that the urine Ehrlich reaction is strongly positive in cases of acute porphyria. This was generally interpreted as due to excessive urobilinogen until 1931, when Paula Sachs1clearly distinguished this substance from the Ehrlich-reacting chromogen in porphyria urines. She based the distinction on differences in solubility and the failure of the porphyria chromogen upon oxidation to exhibit green fluorescence with zinc acetate. Rather, it was oxidized to a brown pigment differing from urobilin and believed to represent what the older literature had rather vaguely designated as urofuscin. Waldenstrom2spoke of this as the red pigment, and still later Waldenstrom and Vahlquist3studied the chromogen in more detail, confirming the observation that, unlike urobilinogen, it is not extracted from urine by most organic solvents. They noted that the Ehrlich aldehyde compound, in addition to the strong absorption band at 550 to" @default.
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- W2058564568 date "1954-05-01" @default.
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- W2058564568 title "SOME STUDIES OF NATURE AND CLINICAL SIGNIFICANCE OF PORPHOBILINOGEN" @default.
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- W2058564568 doi "https://doi.org/10.1001/archinte.1954.00240290001001" @default.
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