Benchtop Micro-ESR Spectrometer from Active Spectrum

Active Spectrum’s Benchtop Micro-ESR™ is a compact instrument that features a patented miniature electron spin resonance spectrometer and an automatic temperature controller. The instrument operates at 9.6GHz with 350 Gauss sweep range and has sub-micromolar sensitivity in aqueous solution.

The portable spectrometer also comes with a full Windows 7 computer system with multiple USB ports, integrated touchscreen and Ethernet. It is globally used in industrial, scientific and educational laboratories.

Key Features

The main features of the Benchtop Micro-ESR spectrometer are:

  • Compact and Portable
  • Operates at 9.6 GHz with a sweep range up to 350 Gauss
  • Sub-micromolar sensitivity
  • Automatic temperature controller
  • Data interface
  • Sample insertion
  • Touch panel display
  • Windows 7 PC with USB ports and Ethernet


The main applications of the Benchtop Micro-ESR spectrometer are as follows:

  • Measuring reactive oxygen and nitrogen species
  • Monitoring thermo-oxidative breakdown of lubricants
  • Spin labeling
  • Spin trapping (BMPO, DMPO, PBN, TEMPOL, PTIO, etc)
  • Crude oil: Asphaltenes and vanadium
  • Dosimetry
  • Kinetics
  • Education
  • Shelf life of food products
  • DNP
  • Soot and carbon black

Key Publications

  • "Disulfide-Linked Dinitroxides for Monitoring Cellular Thiol Redox Status through Electron Paramagnetic Resonance Spectroscopy", Eric A Legenzov et al, Biochemistry, 2015. DOI: 10.1021/acs.biochem.5b00531

  • "On the early reaction stages of ozone with N,N′-substituted p-phenylenediamines (6PPD, 77PD) and N,N′,N″-substituted-1,3,5-triazine “Durazone®”: An electron spin resonance (ESR) and electronic absorption spectroscopy study", Franco Cataldo et al, Polym Degrad Stabil, 2015. DOI: 10.1016/j.polymdegradstab.2014.11.011

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