Oxidation of Cefalexin by Permanganate: Reaction Kinetics, Mechanism, and Residual Antibacterial Activity
作者:Yajie Qian、Pin Gao、Gang Xue、Zhenhong Liu、Jiabin Chen
DOI:10.3390/molecules23082015
日期:——
The oxidation of cefalexin (CFX), a commonly used cephalosporin antibiotic, was investigated by permanganate (PM) in water. Apparent second-order rate constant of the reaction between CFX and PM was determined to be 12.71 ± (1.62) M-1·s-1 at neutral pH. Lower pH was favorable for the oxidation of CFX by PM. The presence of Cl- and HCO₃- could enhance PM-induced oxidation of CFX, whereas HA had negligible
头孢氨苄(CFX)是一种常用的头孢菌素抗生素,其氧化作用是通过高锰酸盐(PM)在水中进行的。在中性pH下,CFX与PM之间反应的表观二级速率常数确定为12.71±(1.62)M-1·s-1。较低的pH值有利于PM氧化CFX。Cl-和HCO 3-的存在可以增强PM诱导的CFX氧化,而HA对PM氧化CFX的影响可忽略不计。在实际废水基质中,PM诱导的CFX氧化也很重要。添加亚硫酸氢盐(BS)后,由于Mn(III)反应性物种的产生,PM诱导的氧化显着加速。产物分析表明CFX被氧化为三种产物,具有两种立体异构的亚砜产物和一种二酮产物。六元环上的硫醚硫和双键是发生PM氧化的反应位点。抗菌活性评估表明,PM氧化后,CFX溶液的活性明显降低。