122 



IV. BILE PIGMENTS 



acid in their absorption. They do not obey Beer's law and, in con- 

 trast to the chloroform solution, contain aggregates. The position 

 of the absorption band of mesobilirubin is the same as that of a- 



500 



300 



450 400 350 



WAVELENGTH, m^ 



Fig. 13. Absorption curve of bilirubin in chloroform (after Heilmeyer, 1213). 



hydroxyl pyrromethenes with saturated side chains; it lies much 

 nearer the ultraviolet than that of nonhydroxylated pyrromethenes 



{2190). 



TABLE V 

 Absorption Spectra of Bilirubins 



