Abstract
This paper deals with the infrared absorption spectra of bilirubin and calcium bilirubinate in order to provide a better understanding in the analysis of gallstones by means of infrared spectroscopy. The infrared spectra of these two authentic compounds, together with powdered pigmented calcium stones and their fractions, have been measured for the purpose of establishing the position and assignment of the characteristic absorption bands. As a result, several erroneous interpretations by previous authors of the spectrum of bilirubin, especially as regards absorptions of carboxyl groups, have been noted. Moreover, some absorption bands which were previously regarded to be characteristic of calcium bilirubinate have been attributed to ethanol-extractable ingredients of the pigmented calcium stone; calcium bilirubinate, both authentic material and a specimen obtained from the residue from ethanol extraction of the pigmented calcium stone, showed a spectrum suggesting bilirubin to be present in the form of its carboxylate.
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