Demystifying EPR: A Rookie Guide to the Application of Electron Paramagnetic Resonance Spectroscopy on Biomolecules

Demystifying EPR: A Rookie Guide to the Application of Electron Paramagnetic Resonance Spectroscopy on Biomolecules
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揭秘 EPR:电子顺磁共振波谱在生物分子中的应用新手指南

DOI:
10.22059/pbs.2014.52305
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发表时间:
2014
期刊:
Progress in Biological Sciences
影响因子:
--
通讯作者:
E. Schubert
E. Schubert
中科院分区:
--
文献类型:
--
作者:
Yaser NejatyJahromy;E. Schubert

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电子顺磁共振(EPR)谱又称电子自旋共振(ESR),特别是在物理学家中,是研究顺磁系统的一种强大而通用的光谱方法,即像自由基和大多数过渡金属离子这样的系统,它们具有未配对的电子。与其他光谱方法和方法相比,EPR的灵敏度和选择性是值得注意和耐人寻味的。作为一种定性方法,EPR可以检测到纳分子范围内的物种。另一方面,这种方法的特殊性源于光谱特征,而光谱特征直接取决于电子自旋中心附近原子的类型、距离和相对取向。除了结构信息,EPR还可以用来阐明所研究体系的随时间变化的行为,它适用于从小分子到大分子的不同大小的体系。以下是对一般EPR方法的简短回顾,面向对EPR知之甚少的读者。它包括适当的代表性系统的例子,用于研究短期顺磁物种甚至抗磁分子的技术,并向读者介绍理解光谱所需的工具。本文仅关注连续波(CW)EPR,而不详述更先进的脉冲EPR方法。
Electron Paramagnetic Resonance (EPR) spectroscopy, also known as Electron Spin Resonance(ESR) especially among physicists, is a strong and versatile spectroscopic method forinvestigation of paramagnetic systems, i.e. systems like free radicals and most transition metalions, which have unpaired electrons. The sensitivity and selectivity of EPR are notable andintriguing as compared to other spectroscopic methods and approaches. As a qualitative method,EPR can detect species down to the nanomolar range. On the other hand, the specificity of themethod stems from spectral features which directly depend on the types, distances, and relativeorientations of the atoms in the neighborhood of the electron spin centers. In addition tostructural information, EPR can be used to elucidate time dependent behavior of the studiedsystem and it is applicable to systems of different size, ranging from small molecules tomacromolecules. The following short review of general EPR methods is intended for anaudience with little prior knowledge about EPR. It includes examples of suitable representativesystems, techniques for the study of short lived paramagnetic species and even diamagneticmolecules, and introduces the reader to tools necessary for making sense of the spectra. Thispaper focuses only on continuous wave (cw) EPR and does not elaborate on the more advancedpulsed EPR methods.
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