In Vitro Kinetic Studies of the Reaction of Hydralazine and its Acetone Hydrazone with Pyruvic Acid
作者:Masahiro Iwaki、Taro Ogiso、Yoshimasa Ito
DOI:10.1002/jps.2600770320
日期:1988.3
between hydralazine (HP) or its acetone hydrazone (HAH), a metabolite of HP and pyruvic acid, a new selective HPLC method for simultaneous determination of HP, HAH, and hydralazine pyruvic acid hydrazone (HPH) was developed. In vitro degradation of HAH and formation of HP and HPH were investigated at pH 7.4 and 37 degrees C in the presence or absence of pyruvic acid. Hydralazine degraded slowly according
为了了解肼苯哒嗪(HP)或丙酮and和丙酮酸的代谢物丙酮(HAH)之间的反应,开发了一种同时测定HP,HAH和肼苯哒嗪丙酮酸(HPH)的新的选择性HPLC方法。在存在或不存在丙酮酸的条件下,在pH 7.4和37摄氏度下研究了HAH的体外降解以及HP和HPH的形成。肼屈嗪按照表观一级速率(7.46 x 10(-2)h-1)缓慢降解。HAH的变性反应,同时水解为母体药物HP,也遭受明显的一级损失(3.00 x 10(-1)h-1)。此外,在丙酮酸存在下,HAH部分转化为HP和HPH。对于HPH的形成途径,与仅由后者反应组成的模型相比,包含HAH与丙酮酸的直接反应以及由反向转化为HP介导的次级形成的模型对实验数据的拟合效果更好。根据估算的速率常数,HAH与丙酮酸直接反应生成约10%的HPH。这些结果表明,HPH的形成并非全部通过向HP的反向转化来完成。