Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . et was not sufficiently controlled to permit the collectionof reliable data. Creatinin crystallizes in colorless, glistening monoclinicprisms (Fig. 90, p. 251) which are soluble in about 12 partsof cold water; they are more soluble in warm water and inwarm alcohol. One of the most important and interesting ofthe compounds of creatinin is creatinin-zinc chloride, tRIXK. 251 (C4H7N30)oZnCl1,, which is formed from an alcoholic solu-tion of creatinin u
Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . et was not sufficiently controlled to permit the collectionof reliable data. Creatinin crystallizes in colorless, glistening monoclinicprisms (Fig. 90, p. 251) which are soluble in about 12 partsof cold water; they are more soluble in warm water and inwarm alcohol. One of the most important and interesting ofthe compounds of creatinin is creatinin-zinc chloride, tRIXK. 251 (C4H7N30)oZnCl1,, which is formed from an alcoholic solu-tion of creatinin upon treatment with zinc chloride in acidsolution. Creatinin has the power of reducing cupric hy-droxide in alkaline solution and in this way may interfere withthe determination of sugar in the urine. In the reduction bycreatinin the blue liquid is first changed to a yellow and theformation of a brownish-red precipitate of cuprous oxide isbrought about only after continuous boiling with an excessof the copper salt. Creatinin does not reduce alkaline bismuthsolutions and therefore does not interfere with Nylanders and Boettgers tests. Iig. Creatinin. It has very recently been shown by Folin that the absolutequantity of creatinin eliminated in the urine on a meat-freediet is a constant quantity different for different individuals,but wholly independent of quantitative changes in the total amount of nitrogen eliminated. Experiments on Separation from the Urine.—Place 250 of urine ina casserole or beaker, render it alkaline with milk of lime andthen add CaCl2 solution until the phosphates are completely 252 PHYSIOLOGICAL CHEMISTRY. precipitated. Filter off the precipitate, render the filtrateslightly acid with acetic acid and evaporate it to a still warm this syrup is treated with about 50 of95-97 per cent alcohol and the mixture allowed to stand 8-12hours in a cool place. The precipitate is now filtered off andthe filtrate treated with a li
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