The lipids of ox compact bone.

Pikular (1955) determined the cholesterol content of compact bone after demineralization with hydrochloric acid. By the digitonide method, the cholesterol content of the organic matter (osseocollagen) was found to be 0-0028-0-0040 g. of cholesterol/100 g. of dry ash-free protein. He also prepared procollagen by the method of Orekhovich, Tustanorskii, Orekhovich & Plotinkora (1948) and showed cholesterol to be present, but did not measure the quantity. Pikular (1955) pointed out that the cholesterol content of the collagenous material was very similar to that found in myostroma by Nikol'skaya (1953) and concluded that the cholesterol was present in the form of loose and firm complexes with protein. Spector (1956) records that compact bone from