Research on Cellulose, 1895-1921 Volume 1

Research on Cellulose, 1895-1921 Volume 1

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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. 1901 edition. Excerpt: ...Schlossberger and Doepping Annalen, 52, 106, and Kaiser. De Bary, on a review of the evidence, adopts this view, but, as the purified substance fails to give the characteristic colourreactions with iodine, he uses the qualifying term 'pilzcellulose' Morph. u. Biol. d. Pilze u. Flechten, Leipzig, 1884. C. Richter, on the other hand, shows that these reactions are merely a question of methods of purification or preparation Sitzungsber. Acad. Wien, 82, 1, 494, and considers that the tissue-substance is an ordinary cellulose, with the ordinary reactions masked by the presence of impurities. In regard to the lower types of fungoid growth, such as yeast, the results of investigators are more at variance. The researches of Salkowski (p. 113) leave little doubt, however, that the cellmembrane is of the cellulosic type. The author's researches extend over a typical range of products obtained from Boletus edulis, Agaricus campestris, Cantharellus cibarius, Morchella esculenta, Polyporus officinalis, Penicillium glaucum, and certain undetermined species. The method of purification consisted mainly in (a) exhaustive treatments with ether and boiling alcohol, (b) digestion with alkaline hydrate (1-2 p.ct. NaOH) in the cold, (c) acid hydrolysis (2-3 p.ct. H2S04) at 95-1oo, followed by a chloroxidation treatment by the processes of Schulze or Hoffmeister, and final alkaline hydrolysis. The products, i.e. residues, thus obtained were different in essential points from the celluloses isolated from the tissues of phanerogams similarly treated. Only in exceptional cases do they give blue reactions with iodine in presence of zinc chloride or sulphuric acid. The colourations are brown to red. They resist the action of cuprammonium solutions. They are for the most...show more

Product details

  • Paperback | 68 pages
  • 189 x 246 x 4mm | 141g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 123652442X
  • 9781236524423