Casein, Its Preparation And Technical Utilisation
Casein, Its Preparation And Technical Utilisation
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On this point Bellamy reports that acetic acid, in the form of vinegar, has hitherto been chiefly used, and sulphuric acid occasionally. The casein must then be neutralised before it can be used further, for which purpose it is steeped in a solution of lime (lime-water) until it no longer reddens blue litmus paper. This treatment furnishes insoluble calcium acetate, which must be washed out before the casein can .be converted into glue. For this reason Bel- lamy recommends that the casein shoul...d be thrown down by means of vegetable substances, whose coagulant properties are based on the presence of tannin, e.g., cutch, China bark, oak bark and other barks, sumach, etc. Special success has attended the use of wild-cherry bark (prunus virginiaTia) for this purpose. The resulting casein does not require neutral- ising, and is easily worked up, besides being more uniform in quality. At the same time, the quantity of the precipitant is immaterial, since any excess remains in solution and therefore does not stick to the casein when this is boiled.
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To quickly assess the difficulty of the text, read a short excerpt:
On this point Bellamy reports that acetic acid, in the form of vinegar, has hitherto been chiefly used, and sulphuric acid occasionally. The casein must then be neutralised before it can be used further, for which purpose it is steeped in a solution of lime (lime-water) until it no longer reddens blue litmus paper. This treatment furnishes insoluble calcium acetate, which must be washed out before the casein can .be converted into glue. For this reason Bel- lamy recommends that the casein shoul...d be thrown down by means of vegetable substances, whose coagulant properties are based on the presence of tannin, e.g., cutch, China bark, oak bark and other barks, sumach, etc. Special success has attended the use of wild-cherry bark (prunus virginiaTia) for this purpose. The resulting casein does not require neutral- ising, and is easily worked up, besides being more uniform in quality. At the same time, the quantity of the precipitant is immaterial, since any excess remains in solution and therefore does not stick to the casein when this is boiled.
What to read after Casein, Its Preparation And Technical Utilisation?
You can find similar books in the "Read Also" column, or choose other free books by Salter, Charles, Tr to read onlineMoreLess
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