Proceedings of the Annual Meeting Volume 6

Proceedings of the Annual Meeting Volume 6

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1884 edition. Excerpt: ...and ten times the weight of the alkaloids, in ether fortior, the flask was corked and vigorously shaken, until by means of the glass all the alkaloids were detached from the flask and ground up in the presence of the ether in fine particles." By this operation the alkaloids are separated into two parts, one (A) soluble in ether and (i?) insoluble in ether. The part soluble in ether contains the quinine and the amorphous alkaloid, together with traces of quinidine; while the insoluble part contains the cinchonine, cinchonidine and quinidine. These two parts are separated by filtration, the insoluble portion washed with a little ether and the etherial solution evaporated. A.--(Part soluble in ether). The ether having been evaporated and the residue dried at 100 C., this may in many instances be practically considered as consisting simply of quinine, but as the estimation of quinidine and amorphous alkaloid is desired, the residue is dissolved in sufficient HC2H3O2 to afford neutral solution and an alcoholic solution of KI added which will produce a sandy precipitate of quinidine hydriodate (C20H24N2O2HI). One part of this hydriodate when dried at 100 C., represents.717 parts of anhydrous quinidine. To the warmed filtrate from the latter precipitate, ammonia water is added until it ceases to produce a precipitate. The mixture is then shaken at once with ether, the etherial solution allowed to evaporate, and the residue dried at 100 C. In one sample this residue was contaminated with a small proportion of amorphous alkaloid; in this case the quinine was estimated as iodo sulphate or herapathite. The method of estimating by this will be found in any text book giving DeVry's process. B.--(Insoluble in ether). This is converted into neutral acetate...show more

Product details

  • Paperback | 68 pages
  • 189 x 246 x 4mm | 141g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236562755
  • 9781236562753