Practical physiological chemistry; a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . also. These acids are very rich in sulphur and resembleetheral sulphuric acids inasmuch as upon treatment with boiling hydro-chloric acid they yield sulphuric acid. The bile pigments are important and interesting biliary constitu-ents. The following have been isolated: bilirubin, biliverdin, bili-fuscin, biliprasin, bilihumin, bilicyanin, choleprasin, and choletelin. Ofthese, bilirubin and biliverdin are the most important and predominatein normal b
Practical physiological chemistry; a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . also. These acids are very rich in sulphur and resembleetheral sulphuric acids inasmuch as upon treatment with boiling hydro-chloric acid they yield sulphuric acid. The bile pigments are important and interesting biliary constitu-ents. The following have been isolated: bilirubin, biliverdin, bili-fuscin, biliprasin, bilihumin, bilicyanin, choleprasin, and choletelin. Ofthese, bilirubin and biliverdin are the most important and predominatein normal bile. The colors possessed by the various varieties of normalbile are due almost entirely to these two pigments, the biliverdin being BILE 20: the predominant pigment in greenish bile and the bilirubin being theprincipal pigment in lighter colored bile. The pigments, other thanthe two just mentioned, have been found almost exclusively in biliarycalculi or in altered bile obtained at post-mortem examinations. Bilirubin, which is perhaps the most important of the bile pigments,is apparently derived from the blood pigment, the iron freed in the. Fig. 55.—Bile Salts. process being held in the liver. Bilirubin has the same percentage com-position as hematoporphyrin, which may be produced from is a specific product of the liver cells, but may also be formed in otherparts of the body. The pigment may be isolated in the form of areddish-yellow powder or may be obtained in part, in the form of reddish- # t Fig. 56.—Bilirubin (Hzmatoidin). (Ogden.) yellow rhombic plates (Fig. 56) upon the spontaneous evaporationof its chloroform solution. The crystalline form of bilirubin ispractically the same as that of hematoidin. It is easily soluble inchloroform, somewhat less soluble in alcohol and only slightly solublein ether and benzene. Bilirubin has the power of combining with 206 PHYSIOLOGICAL CHEMISTRY certain metals, particularly calcium, to form combinations which are nolonge
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiochem, bookyear1916
