Spin label

{
  "id": "MLC-T-CHM-011203",
  "term": "Spin label",
  "field": "Chemistry",
  "definition": "A stable free radical, typically a nitroxide, that is covalently attached to a molecule of interest to introduce an unpaired electron. This allows the molecule's environment and dynamics to be studied using electron paramagnetic resonance (EPR) spectroscopy. Spin labels are widely used in biochemistry to probe protein structure and membrane fluidity.",
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "attachment",
    "group",
    "label",
    "molecular entity",
    "paramagnetic",
    "resonance",
    "stable"
  ],
  "references": [
    "PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1166 (https://doi.org/10.1351/pac199466051077)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/spin-label/"
}