IIICTIONAUY OK THE ACTIVE PKlNCll'LES OF PLANTS. 



83 



Soluble ill 2-'.! parts cold water, in alcohol, chloroform and benzene ; 

 with difficulty in ether or petroleum ether. 



Removed from acid aqueous solution by chloroform and benzene. 

 Reactions : 



[Xot precipitated by lead acetate ; the basic acetate gives slight 



cloud.] 

 Tannic acid, iirecipitates the alcoholic solution. 

 Ferric chloride, brown coloration on warming. 

 [\ot precipitated by gold chloride, or silver nitrate.] 

 Colour tests : 



Concentrated sulphuric acid, colourless, then gradually brown. 



„ „ „ with sugar, gradual red. 



Friihde's solution, brown. 



S} lH'i. QUEBRACHO Colorado (Loxopterigium Lorentzii) ; Ana- 

 cariliarea: Invfstis,'atiir : 0. Hesse, Ami. Cheiii. Phariii., 211, 249. 



LOXOPTERYGINE A., C,,jH,„N._,0., ; M.P. 81° ; amorphous, alkaline, bitter. 

 Soluble in alcohol, ether, chloroform, benzene, acetone ; with difficulty 

 in w:iter. 

 Colour tests : 



Concentrated sulphuric acid with potass, permanganate, violet. 



„ „ „ ,, chromic acid, violet. 



Xitric acid, red. 



Perchloric acid, reddish-brown on warming. 

 Friihde's reagent, violet~^•blue. 



tj ISCi QUEBRACHO bark (Aspidosperma Qnebracho; compare also 

 Payta bark) ; A/mi'i/iKiri'ic. Investigators : Fraude, Ber. d. Chem. Ges., 

 187S, 1K7'.), ISSl : Hesse, loc. At., 1880, and Ann. Chem. Pharm., 211, 249. 

 (d) ASPIDOSPERMINE A., 0„oH3„N„0.^ ; crystallizes in needles or prisms ; 

 M.P. 2().'i°-206" : feebly alkaline, bitter ; laevo-rotatory, [a]D= —100-2 for 

 alcoholic solution. Salts amorphous. 



Soluble in ('i,OO0 parts cold water, 48 alcohol (99 per cent.) at 18° C, 

 lOii iibsolute ether, and in benzene, chloroform, and amyl alcohol. 

 Removed from ammoniacal solution by last three solvents. 

 Precipitants : 



Alkaline hydrates. 



Ammonia. 



Tannic acid. 



Picric acid, yellow. 



? Not platinum chloride but blue coloration (yellow pp., Dupny). 



[Fehling's solution, reduced.] 

 Potassium sulphocyanide, white. 

 Phospho-molybdic acid, white, 

 lodopotassic iodide, brown. 

 Mercuric-potassic iodide, yellow flocculent. 

 Mercuric chloride, white. 

 Colour tests : 



Concentrated sulphuric acid with lead peroxide, i-ed (violet if not 



pure). 

 Concentrated nitric acid, red. 



,, hydrochloric acid warm, red. 



Perchloric acid, sp. gr. MS to 1-4, intense red (white pp., Dupuy). 

 (b) ASPIDOSPERMATINE A., C„.,H,,N,0, ; crystallizes in needles; M.P. 

 Ili2° : l;i.'VO-rotatory ; [a] l)= - 72° ; salts amorphous. 



Soluble in water if freshly precipitated ; also in alcohol, ether, chloro- 

 form, and boiling petroleum ether. 



No colour reaction with concentrated sulphuric acid and ])otassium 

 bichromate. 



(.) ASPIDOSAMINE A., C.,H,sN.jO., ; isomeric with (b). Crystalline, or 

 anii>rplious, becoming graduaUy crystalline ; M.P. 100°. 



Soluble in alcohol, ether, chloroform, benzene ; with difficulty in 

 petroleum spirit ; scarcely in water. 

 Precipitated by -. 



Soilium platinum chloride. I Potassium sulphocyanide. 



(lold chloride. | Mercuric chloride. 



Colour tests : 



(Joncentrated sulphuric acid with potassium bichromate, blue. 

 Perchloric acid, fuchsine red. 

 Fruhde's reagent, blue. 

 (d) QUEBRACHINE A., C„iH„„N,0„ ; cry.stalline, colourless, but turning 

 yellow on exposure ; M.P." 214°-"2l5° ; dextro-rotatory; [a]D = +G2-5, in 

 alcohol, or 18 li in chloroform ; alkaline reaction, bitter. The alcoholic 

 solution gradually acquires a blue tint. Salts cr3'stalline. 



Soluble in hot alcohol, hot ether, or hot jietroleum ether (difficultly in 

 either of these when cold), in amyl alcohol and chloroform ; scarcely in 

 water. 



Removed by chloroform from «<;/</ solution (distinction from strychnine) 

 and from ammoniacal solution by amyl alcohol, though with difficulty ; 

 not removed from acid ^olution by benzene or petroleum ether. 



