Practical physiological chemistry; a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . ed. This pointmay be determined by drawing out a thread-like portion of the mass by means of aglass rod, and if it solidifies immediately and assumes a brittle character we mayconclude that all the taurocholic and glycoholic acid has been decomposed. Decantthe solution and concentrate it to a small volume on the water-bath. Filter thehot solution to remove sodium chloride and other substances which may have sepa-rated, and evaporate the filtrate to
Practical physiological chemistry; a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . ed. This pointmay be determined by drawing out a thread-like portion of the mass by means of aglass rod, and if it solidifies immediately and assumes a brittle character we mayconclude that all the taurocholic and glycoholic acid has been decomposed. Decantthe solution and concentrate it to a small volume on the water-bath. Filter thehot solution to remove sodium chloride and other substances which may have sepa-rated, and evaporate the filtrate to dryness. Dissolve the residue in 5 per centhydrochloric acid and precipitate with 10 volumes of 95 per cent alcohol. Filteroff the taurine and recrystallize it from hot water. (Save the alcoholic filtrate forthe preparation of glycocoll, p. 211.) Make the following tests upon the taurinecrystals. BILE 211 (a) Examine them under the microscope and compare with Fig. 58. (b) Heat a crjstal upon platinum foil. The taurine at first melts, then turnsbrown, and finally carbonizes as the temperature is raised. Note the suflfocatingodor. What is it?. Fig. 58.—Taurine. (c) Test the solubility of the crystals in water and in alcohol. (d) Grind up a crystal with four times its volume of dry sodium carbonate andfuse on platinum foil. Cool the residue, transfer it to a test-tube, and dissolve it inwater. Add a little dilute sulphuric acid and note the odor of hydrogen a piece of filter paper, moistened with a small amount of lead acetate, overthe opening of the test-tube and observe the formation of lead sulphide.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiochem, bookyear1916
