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6699337 
Journal Article 
Chemical composition of enzyme-fractionated aged heart tissue 
Andrews, F; Bjorksten, J; Underwood, C; Thomson, D; Laakso, P 
1965 
13 
(2) 
94-102 
BCI:BCI19654600057425 
Fractionation of the enzyme-nonhydrolyzable constituents of human heart muscle from persons 64-74 years old resulted in separation of a fluorescing fraction, insoluble in anhydrous hydrogen fluoride, and containing 4.6 per cent nitrogen (corresponding to 30 per cent protein). This fraction was free from hydroxyproline and is therefore not derived from collagen. An aromatic aldehyde was consistently separated when the enzymatically nonhydrolyzable fraction was broken down by destructive acid hydrolysis. Infrared data indicate a structure having characteristics in common with coenzyme Q. || ABSTRACT AUTHORS: Authors