Dictionary of the active principles of plants: alkaloids : bitter principles; glucosides; their sources, nature, and chemical characteristics / with tabular summary, classification of reactions, and full botanical and general indexes. By Charles E. Sohn.
- Sohn, Charles E.
- Date:
- 1894
Licence: Public Domain Mark
Credit: Dictionary of the active principles of plants: alkaloids : bitter principles; glucosides; their sources, nature, and chemical characteristics / with tabular summary, classification of reactions, and full botanical and general indexes. By Charles E. Sohn. Source: Wellcome Collection.
Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.
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![hexandra. Pale yellow powder; M.P. 116° or 130°; bitter; feebly alkali hp. Soluble in alcobol and ether, slightly in petroleum ether, scarcely in water. Concentrated sulphuric acid, yellowish green. (26) QU1N0VIN G. (Chinovin, Esenbeckin), C.!ftHJ808 (Gilm and Hlasi- wetz). Amorphous, resinous powder, neutral reaction, taste gradually bitter ; dextro-rotatory (+524° in alcoholic solution). Hydrochloric acid gas decomposes with formation of Quinovic acid (27) and a sweet substance, Quinovite. Soluble in alcohol, less easily in ether, in hot water, but scarcely in cold ; also in chloroform and fatty or essential oils. Reactions : Soluble in alkaline hydrates, ammonia, lime water. Insol. in alkaline carbonates. [No pp. lead acetate neutral or basic to alcoholic solution.] Pp. by other metallic salts and by acids from alkaline solutions. Fehling's solution, not reduced. Colour tests: Concentrated sulphuric acid gradually dissolves, dark red. ,, „ „ with sugar, red. ,, nitric acid, dissolves on warming, with decomposition and evolution of nitrous fumes. (26a) BETA- and ALPHA-QUINOVINS have been prepared and described by Liebermann as distinct substances as follows : « = alpha-quinovin and fl the beta compound—a from cinchona bark, from cuprea bark ; both give glittering scales on adding water to the alcoholic solution. Isomeric : formula = C38H62On. Both dextro-rotatory ; a= +56'6°, 0— +27-9°. Solubility : a, nearly P2 in alcohol (absolute), with difficulty in ether, chloroform, or benzene, and scarcely in water, hot or cold. f3 is insoluble n ethyl acetate or absolute ether (distinction from a) ; /3 forms a crystalline compound with 5 molecules of alcohol; in most other respects ft resembles a. Colour tests with (a): Concentrated sulphuric acid, orange yellow with evolution of carbon monoxide. Glacial acetic acid, pale blue. (27) QUINOVIC ACID. Obtainable from Quinovin, and occurring naturally. C._,4H!804. Crys. scales or needles ; dextro-rotatory ; tasteless. Solubility very slight in alcohol, ether, chloroform, or glacial acetic acid. Insoluble in water. Reactions : Salts with alkalies, crystalline. Alkaline hydrates ) „ carbonates > dissolve to frothy solutions. Ammonia ) Precipitated by acids from alkaline solutions. Copper sulphate pp. gradually with green coloration. Concentrated sulphuric acid, dissolves unchanged (re-precipitated by water). (28) CASCARILLIN B. From China (Quina) nova, etc., and Cascarilla bark (Croton eluteria—Euphorbiacece) ; amorphous, resinous, neutral reaction, bitter. Soluble in alcohol, ether, and benzene, scarcely in water. Removed by benzene from arid solutions. [Not Precipitated by lead acetate neutral or basic nor by tannic acid] Colour tests : Concentrated sulphuric acid, blood-red (? reddish-brown, Dragen- dorff) ; nitric acid or nitre added to the solution after ten to fifteen hours changes the reddish solution to bluish violet, then blood- red ; compare morphine. Nitric acid, reddish-violet. Hydrochloric acid, violet. (29) COPALCHIN B. From Croton pseudoquina (Euphorbiacece). Amor- phous, resinous, bitter. Soluble in alcohol and chloroform, ' partly' in ether—hence pre- sumably impure—scarcely in water. Reactions: [Not precipitated by neutral lead acetate.] Pp. by tannic acid. Concentrated sulphuric acid, red. (30) LIGNOIN B. From old Huanocho bark. C,0H.,jNO8 (C,0H,0O8NH;j ?). Amorphous, brown, humoid. Yields ammonia when boiled with alkali. Soluble in alcohol. Reactions : Alkaline hydrates dissolve brown with evolution of ammonia ; acids re-precipitate. Lead acetate neutral ) fleah.coloured pp. ,, ,, basic ) (31) CALIFORNIN B. (not the Californine from Lotus bark). From China (Quina) Californica = Cascarilla riedeliana or possibly Buena](https://iiif.wellcomecollection.org/image/b21503023_0050.jp2/full/800%2C/0/default.jpg)
