The organic constituents of plants and vegetable substances and their chemical analysis / by G.C. Wittstein ; authorised translation from the German original, enlarged with numerous additions, by Baron Ferd. von Mueller.

  • Georg Christian Wittstein
Date:
1878
Catalogue details

Licence: Public Domain Mark

Credit: The organic constituents of plants and vegetable substances and their chemical analysis / by G.C. Wittstein ; authorised translation from the German original, enlarged with numerous additions, by Baron Ferd. von Mueller. Source: Wellcome Collection.

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    ADDENDA. [Aricill C23 H26 N2 O4. Alkaloid, prepared from the Quina de Ciisco by O. Hesse.—Beautiful, white prisms, fusing at 188°, of very feebly alkaline reaction, and very slightly astringent, not bitter taste, dissolves very easily in chloroform, rather easily in ether (1:20), in 235 parts alcohol of 80%. It behaves towards nitric and sulphuric acids like cusconin, and is precipitable by the same re-agents as cusconin and by iodide of potassium and tannic acid. Acetic acid likewise precipitates the solution of A. in hy- drochloric acid under the form of small, white granules, very dij9S.cultly soluble in cold, more readily in boiling water, and crystallising therefrom in crystals after cooling.] [Capsaicin. The active principle of the fruits of Capsicum annuum, prepared by Tresh.—Colourless prisma of extremely pungent taste, fusible and volatile without decomposition by itself and by the steam of water, the vapours strongly irritating the respiratory organs. The C. dissolves little in cold water, better in boiling water, easily in strong alcohol and ether j also in potash ley, and reprecipitable from the latter solution by addition of a solution of ammonium chloride.] [CllSC01lill=C23 H26 N2 O4 -f 2 H O. Prepared by O. Hesse, from the Quina de Cusco.—White leaflets, or short prisms of dull lustre, fuses at 110°, of very slightly alkaline reaction in alcoholic sohition, dissolves in 35 parts ether, better in alcohol and aceton, very easily in chloroform, little in benzol and petroleum-ether j becomes green with nitric acid, and dissolves with greenish-yellow colour, with the same colour in concentrated sulphuric acid, changing to dark-brown on warming. Its solution in hydrochloric acid is precipitable by ammonia, soda, the sulphocyanide, bi-iodide, ferro- and fenicyanide of potassium, the chlorides of gold and of platinum, iodide of potassio-mercury, phosphotungstic acid. Its salts, when neutral and dissolved in water, react acid, and taste at first rancid, then slightly bitter; the neutral sulphate at last cooling, burning similar to inferior peppermint oil.] [Erythroplllaein. Alkaloid, discovered by Gallois and Hardy in the bark of Erythrophlaeum guinense,—It forms a clear, amber- yellow mass, of crystalline structiu-e under the microscope, dissolves