Transactions of the Guinness Research Laboratory Volume 1

Transactions of the Guinness Research Laboratory 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. 1903 edition. Excerpt: ...used in extractions of malt by water only. The alcohol was removed by distillation in vacuo, and the watersoluble portion was extracted by repeated washing of the residue, which adheres closely to the vacuum pan. This method extracts from 50 to 55 per cent. of the total uncoagulable nitrogen of the malt soluble in cold water, and it presumably includes the amides, amino-acids, and "unclassified nitrogen," which in ordinary circumstances are found in the phosphotungstic filtrate from an aqueous extract. If organic bases occur in the malt, these will also be present in the "alcohol-water-extract." The remaining 45 to 50 per cent. of uncoagnlable nitrogen which is ordinarily extracted by mere water treatment must evidently remain in the malt-residue after the alcoholic treatment, from which it can be recovered by extraction with water, along with the balance of the carbohydrates. This latter portion we shall subsequently refer to as the "water-nitrogen." It is evident that the "alcohol-water-nitrogen" and the "waternitrogen," however obtained, added together should represent the total soluble uncoagulable nitrogen obtainable from the malt by direct water-extraction. (11) Separation of Crystalline Nitrogenous Substances from the Phosphotungstic Filtrates of Malt-extract. We have already seen from the preliminary investigation of the aqueous extracts of malt that the " unclassified nitrogenous substances" which preponderate in these extracts are accompanied by bodies belonging to the class of amides and amino-acids. We have also seen that the application of the nitrous-acid method to these extracts, after precipitation with phosphotungstic acid, gives aD evolution of nitrogen which cannot more

Product details

  • Paperback | 114 pages
  • 189 x 246 x 6mm | 218g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236639189
  • 9781236639189