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- W2772367609 abstract "I. On Choiophphæine or Bilirubine and its Compounds . Sect. 1. The paper commences with a short historical retrospect on the literature of the subject under consideration, in which the researches of Berzelius, Scherer, Hein, Marchand, Heintz, Maly, and Städeler are mentioned. Sect. 2. The author then describes the mode of obtaining a red colouring-matter from ox-gallstones. These concretions have to be extracted with water, alcohol, ether, dilute hydrochloric acid, and ultimately, after repeated extraction with boiling alcohol and ether, with chloroform. This agent dissolves bilirubine or cholophæine , and deposits it, on concentration and the addition of absolute alcohol, in an amorphous condition, or in a crystallized state. Sect. 3. The crystals are dark brown, and have a splendid blue lustre. They are rhombic plates, as represented by a drawing in outline taken from a specimen magnified about twenty times. The amorphous or only crystalline modification is a powder of a splendid red, nearly orange-colour. Sect. 4. The elementary analysis of several specimens yielded results which led to the formula C 9 H 9 N O 2 . Sect. o. Bilirubine dissolves in ammonia, but does not form any permanent compound with it. Its combinations with fixed caustic alkalies are insoluble in an excess of lye. The neutral alkali solution, mostly the one in ammonia, yields neutral salts with monodynamic metals, half-acid salts with didy-namic ones. The neutral monohydrated cholophæinate of silver , C 9 H 10 AgNO 3 , Sect . Ag = 37·5 per cent., is a reddish-brown precipitate, which does not lose the atom of water at 110° C. As a hydrated silver-salt it is anomalous; but a few other animal products, such as hippuric acid, are known also to form such hydrated silver-salts. By means of this compound, the formula of bilirubine, or cholophæine, above given, is shown to express its atomic weight." @default.
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- W2772367609 date "1868-12-31" @default.
- W2772367609 modified "2023-09-23" @default.
- W2772367609 title "Research conducted for the medical department of the privy council at the pathological laboratory of St. Thomas's Hospital. First series.—The chemical nature and composition, combinations, and metamorphoses of the colouring-matters of bile" @default.
- W2772367609 doi "https://doi.org/10.1098/rspl.1867.0039" @default.
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