自由基与许多重要的生理与病理过程密切相关。它的测定方法主要有两类,即仪器测定和化学测定。前者为一种直接测定方法,常用的仪器是顺磁共振仪,亦称电子顺磁共振(Electron paramagnetic resonance, EPR),或称电子自旋共振(Electron spin resonance, ESR)。生物样品的ESR测定较 Free radicals are closely related to many important physiological and pathological processes. There are two main methods for its determination, namely instrument determination and chemical determination. The former is a direct measurement method, commonly used instrument is a paramagnetic resonance instrument, also known as electronic paramagnetic resonance (Electron paramagnetic resonance, EPR), or electron spin resonance (Electron spin resonance, ESR). ESR determination of biological samples