Casein; Its Preparation and Technical Utilisation - Bookswagon
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Casein; Its Preparation and Technical Utilisation

Casein; Its Preparation and Technical Utilisation


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER II. VARIOUS METHODS OF PREPARING CASEIN. In order to obtain white casein, free from the yellow tinge attaching to that prepared with sulphuric acid, several different acids are used in succession as precipitants, a method which also has the advantage of cheapness. The best plan is to first throw down the casein as curd, with sulphuric acid, then dissolve this curd in alkali, and reprecipitate with acetic acid. According to the German patent specification of E. Hatmaker (dated May, 1901), about one and a half parts by volume of sulphuric acid (density 66 B.), diluted with seven of water, are sufficient to precipitate the curd from 1,000 parts of milk. If the operation is performed at a temperature of 100 to 120 F. the curd will come down as large and solid lumps, which must then be thoroughly washed with cold water. The curd from the above quantity of milk can be dissolved in 350 parts of a 5 per cent, solution of bicarbonate of soda, the process being accelerated by warming the whole to 100 F. Acetic acid of about 29 per cent, strength is used, and is added slowly till all the casein has been thrown down and the separated aqueous liquid is perfectly clear. After this liquid has been drawn off the casein is thoroughly washed with cold water. A. Hall recommends that the milk should be curdled with hydrochloric acid, the resulting casein being heated to such a degree that the contained acid volatilises. A current of air is also passed through the mass. According to A. Spitteler, the alkali used in preparing the casein should be replaced by an alkali carbonate, when a colourless, tough casein is desired. In this case the reaction proceeds more gradually. Should a transparent product be desired, the separated substance should not be removed from the solution unti...


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Product Details
  • ISBN-13: 9780217313803
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 74
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 0217313809
  • Publisher Date: 22 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 150 gr


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