Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . Coagulation Test.—Boil some of the filtrate in a test-tube. What happens ? (4) Saturation with Sodium Chloride.—Saturate some ofthe filtrate with solid NaCl. How does this result differ fromthat obtained upon saturating egg albumin solution with solidXaCl? PROTEIDS. 55 (5) Precipitation by Dilution.—Dilute some of the filtratewith 10-15 volumes of water. Why does the globulin pre-cipitate? DERIVED SIMPLE PROTEIDS. These bodies are obtained from nat
Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . Coagulation Test.—Boil some of the filtrate in a test-tube. What happens ? (4) Saturation with Sodium Chloride.—Saturate some ofthe filtrate with solid NaCl. How does this result differ fromthat obtained upon saturating egg albumin solution with solidXaCl? PROTEIDS. 55 (5) Precipitation by Dilution.—Dilute some of the filtratewith 10-15 volumes of water. Why does the globulin pre-cipitate? DERIVED SIMPLE PROTEIDS. These bodies are obtained from native simple proteids byvarious means, e. g., through the action of acids, alkalis, heator enzymes, the method of treatment to which the nativeproteid is subjected depending upon the particular class ofderived proteid desired. These modified bodies are classifiedas albuminates, proteoses (or albumoses), peptones and coagu-lated proteids. Albuminates. The albuminates are derived proteids and are produced bythe action of acids or alkalis upon the native simple proteids,albumins and globulins. There are two classes of albuminates, Fig. EXCELSIN, THE PROTEID OF THE BRAZIL NUT. (Drawn from crystals furnished by Dr. Thomas B. Osborne, NewHaven, Conn.) i. e., acid albuminate and alkali albuminate. They differ fromthe native simple proteids principally in being insoluble inNaCl solution and in not being coagulated except when sus- 56 PHYSIOLOGICAL CHEMISTRY. pended in neutral fluids. Both forms of albuminate are pre-cipitated upon the neutralization of their solutions. They areprecipitated by saturation with (NH4)2S04, and by saturationwith NaCl also if they are dissolved in an acid solution. Acidalbuminate contains a higher percentage of nitrogen and sul-phur than the alkali albuminate from the same source sincesome of the nitrogen and sulphur of the original proteid isliberated in the formation of the latter. Because of this factit is impossible to transform an alkali albumi
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