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Table 1 Type, occurrence and IR bands of principal component observed in gallstones

From: A comparative study of gallstones from children and adults using FTIR spectroscopy and fluorescence microscopy

Type of Stone Occurrence of stonesa (percents) Principal component Principal IR bands observed Literature values (Reference 16).
Black I (adult) 18 Bilirubin 1661, 1626,
1570
1670,1640 (OC=O stretching)
1575(C=C stretching)
Black II (adult)   Cholesterol 3398,2933,
2866,
1463, 1376,
1053
3410,2925 (CH2 and CH3 asymmetric stretching)
2860 (CH2 and CH3 symmetric stretching)
1460,1380 (CH2 and CH3 bending)
1050(C-C stretching)
Black (child) 63 Bilirubin 1661,1626,
1571
Same as above
Brown (adult) 16 Cholesterol 3395,2936,
2899,2866,
1464,1372,
1052
Same as above
Green inner
core (adult)
ND Cholesterol 2933, 2899,
2866,1464,
1381,1052
Same as above
Mixed (adult) ND Cholesterol 3395,2933,
2866,1465,
1376,1056
Same as above
  1. ND represents Not Determined. CaCo3 present in green stone gives rise to two characteristic IR bands at 1445 and 875 cm-1 due to C-O stretching and bending vibrations respectively, aThe listed numbers refer to adults or children.