Flow Esr Detection for Liquid Chromatography of Radicals

An electron spin resonance (esr) spectrometer is applied as a novel specific detector for liquid chromatography of stable free radicals. A uv and a visible optical detector are used simultaneously with the esr detector. The method is employed for detection of several organic radicals eluted from a prepacked silica column. Esr spectra of the eluant are measured repeatedly each minute during the chromatographic separation.