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Alcoholic Fermentation: (English)

Alcoholic Fermentation: (English)

          
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About the Book

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 vi. CARBOXYLASE. An observation of remarkable interest, which promises to throw light on several important features of the biochemistry of yeast, was made in 1911, and has since then formed the subject of detailed investigation by Neuberg and a number of co-workers. It was found that yeast had the power of rapidly decomposing a large number of hydroxy- and keto-acids [Neuberg and Hildesheimer, 1911; Neuberg and Tir, 1911; see also Karczag, 1912, 1, 2]. The most important among these are pyruvic acid, CH3'CO-COOH, and a considerable number of other aliphatic a-keto-acids which are decomposed with evolution of carbon dioxide and formation of the corresponding aldehyde: ? R-CO-COOH= R-CHO+ CO, . The reaction is produced by all races of brewer's yeast which have been tried, as well as by active yeast preparations and extracts and by wine yeasts [Neuberg and Karczag, 1911,4; Neuberg and Kerb, 1912, 2]. The phenomenon can readily be exhibited as a lecture experiment by shaking up 2 g. of pressed yeast with 12 c.c. of I per cent. pyruvic acid, placing the mixture in a Schrotter's fermentation tube, closing the open limb by means of a rubber stopper carrying a long glass tube and plunging the whole in water of 38-40. Comparison tubes of yeast and water and yeast and I per cent. glucose may be started at the same time, and it is then seen that glucose and pyruvic acid are fermented at approximately the same rate [Neuberg and Karczag, 1911, 1]. If English top yeast be used it is well to take O-5 per cent. pyruvic acid solution and to saturate the liquids with carbon dioxide before commencing the experiment. The production of acetaldehyde can be readily demonstrated by distilling the mixture at the close of fermentation and testing for the aldehyde either by Rimini's r...


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Product Details
  • ISBN-13: 9780217676809
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 64
  • Series Title: English
  • Weight: 132 gr
  • ISBN-10: 0217676804
  • Publisher Date: 09 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 3 mm
  • Width: 189 mm


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