Examination of the urine; a manual for students and practitioners . es insipidus and hysteria. Allantoin is obtained from uric acid by oxidation—e. g.,with potassium permanganate—and is decomposed byheat and hydrochloric acid into allanturic acid and urea: C4H6N403 + H20 = C3H4N203 + CH4N20 Allantoin. Allanturic acid. Urea. NUCLEIC ACID Mcerner found nucleic acid in very small quantities inthe urine. Larger amounts appear in combination with 162 EXAMINATION OF THE URINE albumin as nucleo-albumin. These acids arq interesting physiologically, as they are compounds of phosphoric acid, xanthin bas
Examination of the urine; a manual for students and practitioners . es insipidus and hysteria. Allantoin is obtained from uric acid by oxidation—e. g.,with potassium permanganate—and is decomposed byheat and hydrochloric acid into allanturic acid and urea: C4H6N403 + H20 = C3H4N203 + CH4N20 Allantoin. Allanturic acid. Urea. NUCLEIC ACID Mcerner found nucleic acid in very small quantities inthe urine. Larger amounts appear in combination with 162 EXAMINATION OF THE URINE albumin as nucleo-albumin. These acids arq interesting physiologically, as they are compounds of phosphoric acid, xanthin bases, and non-nitrogenous substances. They may contain as much as 9 or 10 per cent, of phosphorus. They do not give the reactions of proteids, but when some of them are boiled with dilute mineral acid, a carbohydrate substance is produced which gives the reduction test with copper. HIPPURIC ACID1 Hippuric acid (C9H9N03) occurs in normal urine of manin quantities of from to 1 gm. in twenty-four hours,varying largely according to the amount of vegetable Fig. 24.—Hippuric-acid crystals (Jakob). It is absent in the urine of carnivora and is very abundantin that of herbivora. It crystallizes in fine needles or in four-sided prisms andpillars wTith ends beveled in two or four planes (Fig. 24). 1 Hippuric acid is classified chemically as one of the aromatic group ofsubstances in the urine. It is placed here for convenience of study. HIPPURIC ACID 163 The typical crystals are vertical rhombic prisms. Hip-puric acid is soluble in water and alcohol, and its solutionsare strongly acid in reaction. It combines with alkalis andalkaline earths to form soluble salts, but its silver, copper,and lead compounds are sparingly soluble in acids precipitate it from solutions of its salts. Onboiling with an alkaline hydrate hippuric acid decomposesinto benzoic acid and glycocoll. This is clinically inter-esting because the same decomposition takes place inalkaline fermenta
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