2. From quinine and citric acid, as the acetate. Needle-shaped prisms.—Dose, &c. As the sulphate or disulphate.
Quinine, Disulphate of. Sulphate of quinine (see below).
Quinine, Ferrocy′anide of. Syn. Cyanide of iron and quinine; Quinæ hydroferrocyanas, Quinæ ferro-prussias, L. Prep.
(P. Cod.) Sulphate of quinine, 100 parts; ferrocyanide of potassium, 31 parts; distilled water, 2500 parts; boil for a few minutes, and, when cold, separate the impure salt which floats as an oily mass on the surface, wash it with a little cold water, and dissolve it in boiling alcohol; the solution will deposit crystals as it cools.
Obs. This compound is by some said to be the most efficacious of all the salts of quinia. Pelouze asserts that it is simply quinine mixed with some Prussian blue.—Dose, 1 to 6 gr.
Quinine, Ferrosul′phate of. See Quinine and Iron, Sulphate of (below).
Quinine, Hydri′odate of. Syn. Iodide of quinine; Quinæ hydriodas, Q. iodidum, L. Prep. 1. By adding, drop by drop, a concentrated solution of iodide of potassium to a like solution of acid sulphate of quinine, and drying the precipitate in the shade; or heat the liquid nearly to the boiling point, and allow it to crystallise.
2. (Parrish.) Effloresced sulphate of quinine, 5 parts, dissolved in alcohol, and decomposed by an alcoholic solution of 3 parts of iodide of potassium, precipitates sulphate of potassa, and yields, on cooling and evaporating, hydriodate of quinine in fine crystalline needles.[130]
[130] “1 and 2 are not identical; 1 is an acid salt which readily crystallises, but 2 is a normal salt which I never saw crystallise, but always like a fluid resin, quite amorphous.”—De Vrij.
3. (Ioduretted—Bouchardat.) From an acid solution of quinia and a solution of iodide of iron containing a slight excess of iron, as No. 1.