Hydroxyl radical induced oxidation of theophylline in water: a kinetic and mechanistic study
作者:M. M. Sunil Paul、U. K. Aravind、G. Pramod、A. Saha、C. T. Aravindakumar
DOI:10.1039/c4ob00102h
日期:——
mol−1 s−1. The transient spectral studies were complemented by the end product profile acquired by HRMS analysis. Various transformation products of theophylline induced by ˙OH were identified by this technique which include derivatives of uric acids (i, iv & v) and xanthines (ii, iii & vi). Further breakdown of the early formed product due to ˙OH attack leads to ring opened compounds (ix–xiv). The kinetic
羟基自由基(˙OH)对新出现的有机污染物的氧化破坏和矿化作用是一个公认的研究领域。在˙OH反应中可能产生危险的副产物,需要对降解机理进行广泛的研究。结合使用脉冲辐射分解和稳态光解(H 2 O 2 / UV光解),然后进行高分辨率质谱(HRMS)分析,以阐明破坏茶碱,模型药物和药物的动力学和机理特征。在本研究中通过˙OH鉴定出污染物。对于中间产物研究,该分子的氧化破坏最初是通过H 2 O 2实现的/ UV光解。byOH与茶碱在pH 6下反应的瞬时吸收光谱主要由(T8-OH)˙的产生引起,其特征在于330 nm处的吸收带(k 2 =(8.22±0.03)×10 9 dm 3 mol -1 s -1)。甲显著不同光谱(λ最大:340纳米)在高度碱性pH(10.2),观察到由于该自由基(p的去质子化ķ一〜10.0)。特定的一个电子氧化剂如硫酸自由基阴离子(SO 4 ˙ - )和叠氮化基团(N 3˙)产生茶碱(p