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acetic acid added alcohol alkali alkaloids ammonia ammonium amount analysis appear aqueous solution base becoming benzoic Bismuth blue boiling brown carbonate cent changing characteristic chloride chloroform cinchonin cinnamic color commoner substances concentrated consist contain cooling crystals deep described dilute dish dissolved in Ioo distillate drops ether ether solution ethyl evaporate examined excess extract fading fatty filter finally five fluorescence fraction given gives glycerin gradually grams dissolved green heating identified indicates insoluble iodide Ioo c.c. Water latter lead liquid material medicinal melting mixture morphin necessary nitric obtained odor orange organic partly phenol pink portion potassium powder precipitate preparations present principles procedure purple quantity quinin reaction reagent removed residue resin salicylic salts sample sanguinarin scheme separated shake slightly Sodium soluble solution starch strychnin substances sugar sulphuric acid tion trace Treat turns usually violet warming wash yellow yielding
Pagina 77 - ... actively metabolic cells, probably contain cysteine in place of cystine in the molecule and, as we have already noticed elsewhere, this difference may be of great importance in cell life (see Heffter and Arnold). If a protein which contains cysteine is dissolved in water and 2-4 drops of a fresh 4-5 per cent, solution of sodium nitroprusside and then a few drops of ammonia are added, an intense purple-red color appears at once. The color disappears on the addition of acetic acid. This reaction,...
Pagina 78 - As explained in the introduction, the second portion of this work describes the methods to be employed in manipulating the various classes of medicinal products in order to effect a separation of their constituents according to the preceding scheme.
Pagina 75 - It also contains an acid aromatic oily liquid chiefly benzyl benzoate, with a little benzyl cinnamate, about 20 per cent.