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Raman Microprobe and Fourier Transform-Infrared Microsampling Studies of the Microstructure of Gallstones

Volume 41, Number 3 (April 1987) Page 407-412

Ishida, H.; Kamoto, R.; Uchida, S.; Ishitani, A.; Ozaki, Y.; Iriyama, K.; Tsukie, E.; Shibata, K.; Ishihara, F.; Kameda, H.

Several kinds of recently advanced microanalytical techniques — like electron probe x-ray microanalysis, laser Raman microprobe, and Fourier transform-infrared spectroscopy combined with a microsampling method — have been used for the study of the microstructure of gallstones. The organic and inorganic constituents of three kinds of gallstones are characterized on a microscopic scale. The microstructure of a cholesterol-bilirubin gallstone with a layered structure has been studied with particular emphasis. Small white particles contained in both a bilirubin gallstone and a cholesterol-bilirubin mixed gallstone have been found to consist of calcium salt of a fatty acid, probably calcium palmitate. The results obtained here will be very useful for understanding the mechanism of the gallstone-formation process.