Allens Commercial Organic Analysis a Treatise On the Properties Modes of Assa
Allens Commercial Organic Analysis a Treatise On the Properties Modes of Assa
Allen, Alfred Henry
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Ash of Yeast. Investigators differ considerably in their results regarding the ash content. This is stated for top yeast to be from 2. 5 to' 1 1. 5%; for bottom yeast from 3. 5 to 10. 1%. Yeast. Too much re- liance, however, cannot be placed upon these figures, as the original materials for analysis were not uniform or have not been stated. The ash is stated to consist of phosphates, sulphates, silicates, chlorides and potassium, sodium, magnesium, and calcium; potassium phos- phate constitutin...g the largest proportion. Nitrogenous Constituents. Mostly proteins; Schlossberger ex- tracted with potassium hydroxide a substance containing 13. 9% nitrogen, Mulder obtained with dilute acetic acid a substance with 16% nitrogen, and Nageli and Loew found in a bottom yeast with 8% nitrogen as follows: Albumin, 36%; glutin-casein, 9%; peptones, 2%. The nuclein bodies, forming the main constituents of the cell nucleus have been studied closely and were isolated by Kossel, and their presence proved by Hoppe-Seyler.
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