Infrared spectroscopic analysis of materials from calcified epithelioma.

An infrared spectrum of the calcified epithelioma excised from the eyelid of a three-year old girl was observed. Main absorption peaks were assigned as proteins and calcium phosphate. The crystallinity of calcium phosphate was 41%. The relative content of proteins and calcium phosphate was monitored as 7.4:1, reproducing the spectrum of the calcified epithelioma with a mixture of keratin and calcium phosphate. An epithelioma taken from the trunk of a 41-year-old man showed no calcification and the infrared spectrum of this epithelioma showed no absorption peaks of calcium phosphate.