Abstract
1. The activity of aldehyde dehydrogenase was measured in brain, heart, kidney, intestine, liver, lung, and muscle of the edible frog ( Rana esculenta L.), using 3,4-dihydroxyphenylacetaldehyde (the biogenic aldehyde derived from dopamine) as the substrate. 2. Aldehyde dehydrogenase activity was detected in all of the organs studied. 3. The liver contained the highest activity (772 nmol/min · g tissue, wet wt). 4. The second highest activity was found in the kidney (401 nmol/min · g), which is at least 10 times higher than that found in kidneys of rainbow trout and common carp. This might be explained by a higher degree of catecholamine deamination (compared to O-methylation) in amphibians than in fish.
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