代谢
雄性大鼠每天经口灌胃1000微摩尔(15)N-氯化铵,连续5天后,在治疗的第5天和接下来的5天内,尿液中排出了较低但显著量的过量(15)N-硝酸根。一个体外化学模型系统被用来证明在生理pH下,氨通过羟基自由基被氧化成硝酸根是化学上可行的。这些结果与非酶促过程假设一致,该过程涉及活性氧种,如羟基自由基,将氨氧化为硝酸根。
Male rats gavaged with 1000 umol (15)N-ammonium chloride each day for 5 days excreted low, but significant amounts of excess (15)N-NO3- in urine on the 5 days of treatment & on the 5 subsequent days. An in vitro chemical model system was used to demonstrate that oxidation of ammonia to NO3- by the hydroxyl radical at physiological pH is chemically feasible. These results are consistent with the hypothesis that ammonia is oxidized to NO3- in vivo by a nonenzymic process which involves active O species such as the hydroxyl radical.
来源:Hazardous Substances Data Bank (HSDB)