A course of elementary practical bacteriology : including bacteriological analysis and chemistry / by A. A. Kanthack ... J. H. Drysdale.

  • Kanthack, A. A. (Alfredo Antunes), 1863-1898.
Date:
1895
Catalogue details

Licence: Public Domain Mark

Credit: A course of elementary practical bacteriology : including bacteriological analysis and chemistry / by A. A. Kanthack ... J. H. Drysdale. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

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    Ptomaines—Cadaverine—Putrescine Ptomaines Cadaverine and Putrescine (Udrausky and Baumann). (1) Allow a solution of white of egg to putrefy for several days. (2) Distil to a small volume: indol, scatol, and phenol pass over in the distillate, and are disregarded. (3) Filter the residue. (4) To the filtrate add an equal volume of a 10 per cent solution of caustic soda. (5) Shake, and gradually add, drop by drop, a solution of benzoyl chloride : a crystalline precipitate appears. (6) Allow to stand for several days. (7) Filter. (a) Strongly acidulate the turbid (a) The residue must be digested filtrate with sulphuric acid (benzoic in spirit, acid passes off). (6) Shake up with three times (6) Filter and evaporate the its volume of ether and filtrate to a small bulk.