Tissue concentrations of coenzyme Q, ubichromenol and tocopherol in relation to protein status in the rat

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Abstract
Protein deprivation in the diet of adult and weanling rats resulted in lowering the contents of coenzyme [image] and ubichromenol in liver and heart. The contents of coenzyme [image] and ubichromenol in liver and heart of weanling rats increased with the increase in the percentage of protein in the diet. The coenzyme [image] con-tents of kidney, spleen and brain were little affected. Addition of phenylalanine or coenzyme [image] to the diet containing 6% of casein in-creased the coenzyme [center dot] content in the liver. The liver-succinoxidase activity markedly decreased as the protein concentration in the diet decreased. Addition of coenzyme [image] or phenylalanine to the diet with 6% of casein did not increase the liver-succinoxidase activity.