代谢
从硝基酯中形成亚硝酸盐离子的特性在兔子的血液和组织悬浮液中得到了研究。悬浮液是通过将白兔的新鲜组织与四部分水缓冲液均质化制成的。将等体积的组织匀浆和硝基酯溶液混合。移取样品并进行亚硝酸盐分析。当硝甘油与肝脏匀浆一起孵化时,会迅速形成无机亚硝酸盐,但与肌肉匀浆或稀释的全血一起孵化则不会。硝基甘油、L-葡萄糖三硝酸和己糖醇六硝酸形成亚硝酸盐的速率受到pH值的影响。在pH值为8.4时,形成的体积最高。热对硝基甘油和己糖醇六硝酸有灭活作用,但在低温下对L-葡萄糖三硝酸仅部分灭活,而在60至100摄氏度之间,活性增加。对于己糖醇六硝酸,释放的亚硝酸盐量随着酯浓度的增加而增加。作者得出结论,无机亚硝酸盐是通过正常兔组织中的两个系统从多元醇的硝基酯形成的。第一个主要发生在肝脏,对热不稳定,而第二个在肝脏、肌肉和血液中,可被热激活。
The nature of the formation of nitrite ion from nitrate esters in the presence of blood and tissue suspensions from rabbits was examined. Suspensions were made by homogenizing one part fresh tissue from white-rabbits and four parts aqueous buffer. Equal volumes of the homogenate and a solution of nitrate ester were mixed. Samples for nitrite assay were removed and analyzed. Inorganic nitrite was formed rapidly when glycerol-trinitrate was incubated with the liver homogenate but not with muscle homogenate or diluted whole blood. The rate of nitrite formation from glycerol-trinitrate, l-glucosan-trinitrate, and mannitol-hexanitrate was influenced by pH. Highest volumes formed when the pH was 8.4. Heat had an inactivation effect for glycerol-trinitrate and mannitol-hexanitrate but only partial inactivation took place at low temperatures for l-glucosan-trinitrate while at temperatures between 60 and 100 degrees-C, activity increased. For mannitol-hexanitrate, the amount of nitrite liberated increased with increasing ester concentration. The authors conclude that inorganic nitrite is formed from nitrate esters of polyhydric alcohols by two systems occurring in normal rabbit tissues. The first, occurring principally in the liver, is heat labile while the second, found in liver, muscle, and blood, is activated by heat.
来源:Hazardous Substances Data Bank (HSDB)