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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![poisonous. Acids readily change into sugar and Grdtiosoletin, which is very bitter and gives precipitate with tannic acid. Solubility (of Gratiosolin) 1 in 7 parts cold or 5 of boiling water, 3 cold or 2 boiling alcohol, 1,70!) cold or 1,100 boiling ether. Reactions: [No precipitate by lead acetate, neutral or basic] Tannic acid, pp. Colour tests : Concentrated sulphuric acid, brownish-red ) (water precipitates Nitric acid, dissolves \ yellow). § 117. GUACHAMANIA toxifera ; Apocynacece. GUACHAMANINE A. ; amorphous, yellow, resinous, alkaline, bitter. Salts amorphous. Soluble iu water, not in alcohol. Precipitated by alkaloid reagents. § 118. HARMALA (Peganum Harmala) ; Zygophyllacece. The seeds —about 2§ per cent, (a), and 1^ per cent. (b). Fritsche, A nn. Chem. Pharm., vols. 64, 68, 72, 88, 92. (a) HARM A LINE A., C1;!H14N„0 ; colourless rhombic octahedra, but salts yellow and fluorescent ; M.P. 238° (with decomposition) ; alkaline re- action, slightly bitter (saliva becomes coloured yellow. Soluble in 1,600 parts water at 0° C, in hot alcohol, with difficulty in cold alcohol and ether, slightly in petroleum ether and turpentine. Precipitants: Alkaline hydrates. „ carbonates. Ammonia hydrate. ,, carbonate. Platinum chloride, light yellow microscopic crys. Potass, ferrocyanide, red. Acids and salts precipitate from solutions. (6) HARMINE A., C^H^NoO; colourless, glittering rhombic prisms; salts either colourless or slightly yellow, showing blue fluorescence; M.P. 256°-257°, with sublimate; reaction alkaline; taste bitter (in alco- holic solution, but not the solid). Soluble with difficulty in water, alcohol (cold), or ether; more easily in hot alcohol. Potass, ferricyanide, pp. oily, changing to greenish-blue crys. Potass, sulphocyanide, yellow crystalline. Potass, bichromate (acid soln.), pp. oily, becoming crystalline. Mercuric chloi'ide, white. Precip'tants: Alkaline and ammonia hydrates and carbonates. Platinum chloride, yellow amorphous, becoming crystalline. Potassium sulphocyanide, white crystalline. „ chromate, pp. decomposing with formation of bichromate. ,, bichromate. Mercuric chloride, white. §119. HEDERA helix (Ivy); Araliaeece. Investigator: Vernetr BerichU' d. Ch. (>«., 14,685, and others. (For Carotin, contained in the leaves, see Daucus.) (a) HELIXIN G. (Hedera Glucoside), C:i2H54Ou (Vernet), or C3,H5l!O10~|-2H2O (H. Block); crys. needles; M.P. 233°; lasvo-rotatory ([a]o= — 475°); acid reaction, slightly bitter-sweet taste. Acids convert to a non- fermentable sugar, which reduces Fehling's solution, and a substance C2t;H4406; see (b). Soluble in alcohol, hot benzene, and hot acetone ; with difficulty in ether and cold benzene, and not in water, chloroform, or petroleum ether. Reactions : Alkaline hydrates dissolve with green colour when hot. Ammonia, dissolves yellow. Lead acetate, neutral pp. Ferric chloride, green coloration. [Fehling's solution not reduced till the Helixin has been boiled with acid.] Potassium sulphocyanide, rose coloration (not permanent). [Mercurous nitrate, no action.] Colour tests: Concentrated sulphuric acid, bright red. „ „ „ with potassium bichromate, red, be- coming green. Nitric acid, no colour. Hydrochloric acid, yellow. (6) HELIXIGENIN (suggested name), from preceding substance bv action of acids, C2SH<40g; M.P. 276°-280°; dextro-rotatory ([a]o=+42-6°). Solubility similar to that of Helixin. § 120. HELIOTROPUM Europaeum. Cynoglossum vulgare, etc.; Boraginacece, Investigators: Battandier, Repert. Pharm., vol. 32; Schlagdenhauffer, Buchheim, and others.](https://iiif.wellcomecollection.org/image/b21503023_0068.jp2/full/800%2C/0/default.jpg)
