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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![Precipitants: Alkaline hydrates. „ carbonates. Ammonia (somewhat soluble, and also in amm. chloride). „ carbonate after some hours. Alkaline bicarbonate if not dilute (no pp. at 1 in 200). Mem. : Tartaric acid prevents the precipitation by bicarbonates, for a time. [No pp. sodium acetate, compare Opium.] [Not lead acetate, neutral or basic] Tannic acid, yellowish-white ; soluble in warm hydrochloric acid. Picric acid, amorphous. [Not ferric chloride.] Platinum chloride, light yellow, nearly white; insol. in hydrochloric acid. Gold chloride, yellow amorphous. Potassium ferrocyanide ; sol. warm, and in excess. ,, sulphocyanide, white changing to needles, ( ,, cyanide, red coloration.) Silver-potassic cyanide, white amorphous. Potassium bichromate, yellow amorphous (cloud at 1 in 3,000). Chromic acid (5 per cent.), a pp. with neutral salts of Q. Phospho-molybdic acid, white amorphous (caustic potash dissolves the pp. to light yellow solution, see Morphine). Phospho-tungstic acid, 1 in 100,000. Phospho-antimonic acid, pp. (cloud at 1 in 5,000). Iodo potassic iodide, reddish-brown. Potassic iodide. Bismuth-potassic iodide, orange-red (cloud at 1 in 50,000). Zinc-potassic iodide. Mercuric-potassic iodide, amorphous : limit 1 in 125,000. Mercuric chloride, white amorphous ; sol. in amm. chloride. Chlorine water in not too great excess, then ammonia ; green flocks soluble in excess to an emerald solution, (thalleioqnin reaction) ; by careful neutralization : blue~vviolet~vred ; becoming again green with excess of ammonia. (Potash to the chlorine solution, yellow ; lime-water, red). Test applicable 1 in 20,000. Bromine water, as with chlorine. Other Colour reactions, negative. Concentrated sulphuric acid ) , , . -i-i > colourless. „ „ „ with sugar J Concentrated sulphuric acid with potas. bichromate, merely light yellow. Per-iodic acid, iodine liberated. Frohde's reagent, greenish. Nitric acid alone 1 , , .,, , , • > colourless. ,, ,, with sulphuric ) (2a) ISOQUININE. From Quinine by solution in strong sulphuric acid. Not precipitated by sodium tartrate. (2b) QUINICINE, isomer of Quinine ; formed by heating acid sulphate of quinine to 135°, and occurring in ' Quinoidine,' see (24). Yellowish amorphous, bitter, alkaline, dextro-rotatory ; M.P. about 60°, non- fluorescent. Soluble in alcohol, chloroform, ether ; but with difficulty in water. Reactions: Absorbs carbonic acid. Alkaline hydrates / oily pp. incomplete ; only cloud in presence of Ammonia ) ammonium chloride. [No pp. tartrate.] Potassium sulpho-cyanide, oily pp. Chlorine water then ammonia, as with quinine, but less intense. (2c) AP0QUININE A , Cli,H22N202+2H20 ; from Quinine by heating with hydrochloric acid in sealed tube to 140°, whereby CH3 is eliminated (escaping as methyl chloride). Crystalline, lsevo-rotatory, alkaline, bitter, non-fluorescent; M.P. 160°. Soluble in alcohol ether, chloroform, and hot water ; difficultly in the latter when cold. Precipitated by alkaline hydrates and ammonia, but soluble in excess. Chlorine water then ammonia (thalleioquin reaction), green colora- tion, but only faintly. (2a1) Q£//7T/V//V£=Dihydroxiquinine. From Quinine by oxidation with potassium permanganate. (2e) HYDR0.QUININE A., C20H26N2O2, and with 2H20. Accompanies Quinine (in the Cinchona barks, and up to 4 per cent, in commercial quinine sulphate ; separable from Quinine by fractional precipitation of the acid sulphates). Crystalline, lrevo-rotatory ( - 1422°), alkaline, bitter ; M.P. 168°, fluorescent in sulphuric acid solution. Soluble in alcohol, ether, chloroform, benzene, carbon bisulphide, aqueous acetone and ammonia ; slightly in water.](https://iiif.wellcomecollection.org/image/b21503023_0043.jp2/full/800%2C/0/default.jpg)
