Tissue distribution of the molybdenum hydroxylases, aldehyde

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Abstract
The activity of the molybdenum hydroxylase, aldehyde oxidase, was determined in crude homogenates and (NH4)2S04 fractions prepared from guinea pig liver, lung, kidney, intestine, spleen and heart. Xanthine oxidase was also measured in (NH4)2S04 fractions. In each case, xanthine oxidase levels were lower than those of aldehyde oxidase; activity of the latter enzyme was highest in the liver, whereas xanthine oxidase was predominant in the small intestine. There was no significant difference in the activity of either molybdenum hydroxylase between tissues taken from male and female guinea pigs.