Micro E S R

microESR: The Portable Research-Grade Instrument

The microESR is a small, portable research grade instrument. The spectrometer has a mass of only 10 kg and a 30.5 x 30.5 x 30.5 cm3 foot print. It can easily fit in a fume hood or glove box, or be transported to the field. It requires no special installation or regular maintenance.

The microESR is also an ideal teaching tool for undergraduate chemistry labs. This instrument enables classroom demonstrations of both simple topics such as free radicals in everyday life to far less intuitive subjects including electron density, spin-orbit coupling, spin-spin exchange, and forbidden transitions. The Education Package is a very good investment for Chemistry Departments as there are a wide range of labs and subjects that can be addressed with the microESR.

  • Operating Frequency: X-Band
  • Continuous Wave
  • Field Sweep Range: 500 G centered at g=2
  • Spectrum simulation and fitting
  • Easily run samples at liquid nitrogen temperature

microESR is a small, portable research grade instrument


Reaction kinetics, free radical chemistry, catalysts, DNP

Beer Analysis

Improving Flavour Stability with EPR


Free radicals in polymers and polymerization, petrochemistry, thermoxidative breakdown of lubricants and fuel, real time analysis of additives, antioxidants in lubricants and fuels.

Materials Science

Polymer degradation


microESR – Electron Spin Resonance for the Education Market

Enhance your curriculum with an affordable and easy-to-use microESR instrument. The microESR is ideally suited for teaching and education applications in electron spin resonance (ESR). It offers research-grade results in a compact, portable instrument that features an easy-to-use interface.

  • ESR provides quantitative analysis of paramagnetic species
  • Because it's the only technique to detect species with unpaired electrons, ESR crosses many disciplines, such as biology, chemistry, physics, medical science and material science, opening career options for students

Why Choose the microESR?

  • Focus on the Subject: Intuitive measuring and calibration menus make the instrument accessible to students and teachers alike. With the Bruker microESR it is easier to visualize quantum mechanics
  • Save Space: Small footprint and lightweight, ideal for classrooms or labs with limited benchtop space
  • Get Started Faster: Quick and easy installation.
  • Connect to Your Class: Modern touchscreen interface appeals to students with familiar swipe, pinch, and drop menus

microESR Education Package

  • microESR Spectrometer
  • microESR Experiments Manual
  • microESR Instructor's Guide
  • Lab Accessory Kit
  • microESR User's Manual
  • microESR Analysis and Processing Software with Manual

microESR – Electron Spin Resonance for Edible Oil Analysis

Rancidity of edible oil is a major problem in food related industries. It occurs during storage and is caused by free radical oxidation of unsaturated fatty acids, resulting in foul odors and tastes in the final product. During the past two decades, the food industry has transitioned to the use of natural plant extract-based antioxidants in a variety of food products. The goal is to protect the shelf life of products from free radical oxidation without the use of traditional synthetic food additives. Many of the synthetic additives developed in the 1950s and 1960s are now known to have adverse health effects.

  • Develop products with longer shelf life
  • Faster development for new formulations
  • Decrease time-to-market
  • Validate performance of new raw materials

Recently, a new trend has emerged that combines culinary with science in what are referred to as “Innovation Kitchens”. Here, the combination of unique new recipes made with natural healthy ingredients are created by teams of scientists and culinary experts. One aspect of these Innovation Kitchens involves testing of new formulations and recipes to optimize their shelf life. Many older test methods are still in use, but some of these require longer shelf life testing times, and hence, longer times to validate a new product for market. Electron Spin Resonance (ESR) provides a testing technique that measures free radicals formed during the oxidation of many materials including edible oils and edible oil containing food products. In many cases, the time to validate a new product’s ability to resist free radical oxidation is cut in half. 

Bruker has developed a benchtop electron spin resonance instrument with automation and a software solution designed specifically for measuring free radical oxidation and shelf life in food products. The combined system and SOP provide an easy workflow for measuring oxidation profiles in food samples.

  • Determine Oxidative resistance in as little as 30 minutes
  • Measures free radicals instead of end products
  • Includes SOP for sample preparation and analysis
  • Compact lightweight with very small footprint


To learn more download the application note

New SampleBench Automation

  • Specifically designed for the microESR
  • Provides automated, unattended use
  • Fully reproducible results

microESR related literature


Download Documents

Please fill in the form below to download the content.


Dear Customer,


thank you for your interest. Your request was successfully submitted.


Best regards,

Your Bruker Team