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The Analyst Volume 14

The Analyst Volume 14


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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. 1889 Excerpt: ...The quantity of alcohol ordered is too small, and should be doubled. 2. As a rule, the ethor, when shaken with acid water, forms a troublesome emulsion. 3. Twice shaking with ether is insufficient. 4. The residue left on evaporation is not pure cocain, as it did not dissolve completely in hydrochloric acid, and left about 50 per cent. of insoluble residue. It is also dangerous to distil a strongly acid alcoholic solution of cocain, as it so readily decomposes. The author next tried the process of Castaing. Fifty grammes of coca leaves were treated with 400 c.c. of boiling water, and after standing for half an hour percolated. The residue was then percolated with alcohol of 85 per cent., and the mixed filtrates thrown down with lead acetate. After the excess of lead had been removed with sodium sulphate, the liquid was concentrated, filtered, rendered alkaline with sodium carbonate, and shaken out with ether. The amount of cocain was-38 per cent., but it was only partly soluble in dilute hydrochloric acid, and much coloured. The next process tried was that of Albertoni and Guareschi. Fifty grammes of the leaves were exhausted with ether, the ether was distilled off, the residue treated with boiling water, and the solution evaporated to dryness with a little magnesia. On extraction with amy lie alcohol, -14 per cent. of alkaloid was obtained. As a last resource, Bignon's process was tried. Fifty grammes of the powdered leaves were macerated for fortyeight hours with a 20 per cent. solution of sodium carbonate, then dried on the waterbath and exhausted with petroleum spirit to dissolve the cocain. The solution was shaken with dilute hydrochloric acid, which takes up the cocain. The acid fluid was then rendered alkaline and shaken with'ether, which extracted the...


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Product Details
  • ISBN-13: 9781130687231
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 126
  • Spine Width: 7 mm
  • Width: 189 mm
  • ISBN-10: 1130687236
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 240 gr


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