Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . Dissolve about 10 gram- of a commercial ex-tract of meat in 200 of warm water. Precipitate the inor- 2l6 PHYSIOLOGICAL CHEMISTRY. ganic constituents by neutral lead acetate, being careful not toadd an excess of the reagent. Write the equations for thereactions taking place here. Allow the precipitate to settle.,then filter and remove the excess of lead in the warm filtrateby H2S. Filter while the solution is yet warm, evaporate theclear filtra
Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . Dissolve about 10 gram- of a commercial ex-tract of meat in 200 of warm water. Precipitate the inor- 2l6 PHYSIOLOGICAL CHEMISTRY. ganic constituents by neutral lead acetate, being careful not toadd an excess of the reagent. Write the equations for thereactions taking place here. Allow the precipitate to settle.,then filter and remove the excess of lead in the warm filtrateby H2S. Filter while the solution is yet warm, evaporate theclear filtrate to a syrup and allow it to stand at least 48 hoursin a cool place. Crystals of creatin should form at this under the microscope (Fig. yy, page 209). Treatthe syrup with 200 of 88 per , stir well with aglass rod to bring all soluble material into solution, and thenfilter. The purin bases have been dissolved and are in thefiltrate, whereas the creatin crystals were insoluble in the 88per cent alcohol and remain on the filter paper. Wash thecrystals with 88 per cent alcohol, then remove them and bring Fig. Hypoxaxtiiix Silver Nitrate. them into solution in a little hot water. Decolorize the solu-tion by animal charcoal and concentrate it to a small the solution to cool and note the separation of colorlesscrystals of creatin. Examine these crystals under the micro-scope and compare them with those reproduced in Fig. yy,page 209. MUSCULAR TISSUE. -17 2. Hypoxanthin.âEvaporate the alcoholic filtrate fromthe creatin to remove the alcohol. Make the solution annnn-niacal and add ammoniacal silver nitrate until precipitationceases. The precipitate consists principally of hypoxanthinsilver and xanthin silver. Collect these silver salts on a filterpaper and wash them with water. Place the precipitate andpaper in an evaporating dish and boil for one minute withnitric acid having a specific gravity of Filter while hotthrough a double
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