The Effect of Titratable Acidity Upon Heat Coagulation in Evaporated Milk (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from The Effect of Titratable Acidity Upon Heat Coagulation in Evaporated Milk<br/><br/>Milk has always, when fresh, an amphoteric reaction, turning blue litmus paper slightly red, and red litmus slightly blue. A similar reaction is possessed by certain phosphate solutions, and it is to the presence of such in milk that this reaction is due. This reaction has acquired a false import ance, owing to the erroneous idea that neutrality as measured by the action of litmus is chemical neutrality; with the recognition of the fallacy of this idea the importance of the amphoteric reaction vanishes. The acid reaction, however, has acquired some importance. It is well known that milk just drawn from the udder contains substances that cause it to appear to be slightly acid when examined by applying an acid test. This acidity of fresh milk is called the apparent acidity, to distinguish it from the real acidity due to lactic acid which is normally developed later by the action of bacteria on the milk sugar.

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