Abstract
The effect of acetaldehyde on urinary salsolinol (6, 7-dihydroxy-1-methyl-1, 2, 3, 4-tetrahydroisoquinoline) after ethanol intake was investigated. Healthy Japanese male volunteers were divided into two groups, i.e., a normal aldehyde dehydrogenase (ALDH) group of 13 subjects with a low Km isozyme of ALDH and a deficient group of 12 subjects. The subjects were given 0.4 or 0.8 g/kg of ethanol. Blood ethanol and acetaldehyde levels, urinary excretions of salsolinol, norepinephrine, epinephrine and dopamine were determined. A significant elevation of salsolinol in urine was found after intake of 0.8 g/kg of ethanol in the two groups, but the increase in the deficient group was greater than that in the normal group, while 0.4 g/kg of ethanol did not affect the excretion of salsolinol in either group. Blood acetaldehyde was highly correlated with urinary salsolinol (r=0.88, p<0.001) and the correlation coefficient was greater than that between blood ethanol and salsolinol.
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