Diagnostic methods, chemical, bacteriological and microscopical : a text-book for students and practitioners . Leucin is soluble in water, acids, and alkalies, and insoluble, to a moreor less extent, in alcohol. Not always do we find crystals of leucin in the sedi-ment when the urine contains this substance. If it be suspected, the urineshould be evaporated to a small bulk and alcohol added to the residue, whichmay then be examined for the characteristic crystals. This leucin may beidentified by Scherers test as follows: Some of the solid residue obtained byconcentrating the urine to a small b
Diagnostic methods, chemical, bacteriological and microscopical : a text-book for students and practitioners . Leucin is soluble in water, acids, and alkalies, and insoluble, to a moreor less extent, in alcohol. Not always do we find crystals of leucin in the sedi-ment when the urine contains this substance. If it be suspected, the urineshould be evaporated to a small bulk and alcohol added to the residue, whichmay then be examined for the characteristic crystals. This leucin may beidentified by Scherers test as follows: Some of the solid residue obtained byconcentrating the urine to a small bulk is evaporated with concentrated nitricacid on a platinum crucible cover. With pure leucin the residue remainscolorless, but as usually applied to the urine a yellowish residue obtains. This ^;^0 DIAGNOSTIC METHODS. is heated with a few drops of sodium hydrate solution, when a yellowish orbrown color will be observed. If further heating be applied the leucin willcollect into an oily drop which rolls around on the heated surface. As leucindoes not stain with Sudan-Ill it should not be confused with Fig. 96.—Pure leucin. (Hawk.) (8). Tyrosin (C9H,,N03). Chemically, tyrosin is p-oxyphenyl-a-amino-propionic acid. As foundin the urine tyrosin crystallizes in the form of fine colorless needles, whichmay appear black and are arranged in sheaf-like collections or rosettes. Likeleucin, it may not crystallize out unless the urine be concentrated. Tyrosin
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