Abstract
Urinary excretion rate of nitrate in man was studied by determining the amount of nitrate ingested with foods and beverages and that excreted into urine for 24hr and 48hr.The mean nitrate concentration ±S. D. in the urine (n=33) which were collected from 11 subjects at random was 74.4±42.5ppm. The excretion amounts of nitrate in the 24hr urine obtained from 9 subjects who ingested conventional diet containing from 44.1 to 864.2mg of nitrate was from 45.6 to 236.9mg, indicating a remarkable and individual differences of urinary excretion rate of nitrate (27.4 to 133.8%). The excretion amount of urinary nitrate every 2hr in two subjects was less than 10mg when only the low-nitrate diet containing a small amount of nitrate was ingested, but increased more than 25mg every 2hr by the ingestion of 200mg of sodium nitrate or 100g of salted Chinese cabbage, containing 75.1mg of nitrate, with the low-nitrate diet. The range of the urinary excretion rates of nitrate for 48hr was from 78.2 to 86.2% (n=3). No nitrite was detected in any urine specimens, and neither nitrate nor nitrite was detected in any feces (n=6).
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