Quantitative 31P NMR detection of oxygen-centered and carbon-centered radical species
作者:Dimitris S. Argyropoulos、Hongyang Li、Armindo R. Gaspar、Kamilah Smith、Lucian A. Lucia、Orlando J. Rojas
DOI:10.1016/j.bmc.2006.02.009
日期:2006.6
Quantitative 31P NMR spin trapping techniques can be used as effective tools for the detection and quantification of many free radical species. Free radicals react with a nitroxide phosphorus compound, 5-diisopropoxy-phosphoryl-5-methyl-1-pyrroline-N-oxide (DIPPMPO), to form stable radical adducts, which are suitably detected and accurately quantified using (31)P NMR in the presence of phosphorus containing
定量31P NMR自旋捕获技术可以用作检测和定量许多自由基物种的有效工具。自由基与一氧化氮磷化合物5-二异丙氧基-磷酰基-5-甲基-1-吡咯啉-N-氧化物(DIPPMPO)反应,形成稳定的自由基加合物,可使用(31)P NMR对其进行适当检测和准确定量含磷的内标物的存在。最初,分配了以氧为中心(* OH,O2 *-)和以碳为中心(* CH3,* CH2OH,CH2 * CH2OH)的自由基加合物的31P NMR信号。随后,在各种实验条件下证明了所开发技术的定量可靠性。发现与DIPPMPO的羟基和超氧化物反应加合物的31P NMR化学位移为25.3、16.9和17。1 ppm(在磷酸盐缓冲液中)。* CH3,* CH2OH,* CH(OH)CH3和* C(O)CH3自旋加合物的31P NMR化学位移分别为23.1、22.6、27.3和30.2 ppm。总的来说,这项工作为有针对性地了解各种生