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Fig. 5 | Biomaterials Research

Fig. 5

From: Classification of gallstones using Fourier-transform infrared spectroscopy and photography

Fig. 5

Fourier-transform infrared (FT-IR) spectra of a cholesterol gallstone mixed with calcium carbonate (top) and a cholesterol gallstone mixed with both calcium carbonate and calcium bilirubinate (bottom). The presence of calcium carbonate is indicated by the absorption peaks at 1458, 872, and 855 cm− 1, and calcium bilirubinate by a triplet absorption peak centered at 1624 cm− 1 and a pyrrole N-H absorption peak at 3398 cm− 1

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