d-ion

{
  "id": "MLC-T-CHM-003229",
  "term": "d-ion",
  "field": "Chemistry",
  "definition": "An N-terminal fragment ion of a protonated peptide, formed in high-energy collision-induced dissociation, that is an a-type ion which has also lost part of the side chain of its C-terminal residue. The d ions of leucine and isoleucine differ because their branched side chains lose different groups. The C-terminal counterpart of the d ion is the w ion.",
  "subject": "Analytical Chemistry",
  "references": [
    "PAC, 2013, 85, 1515. 'Definitions of terms relating to mass spectrometry (IUPAC Recommendations 2013)' on page 1537 (https://doi.org/10.1351/PAC-REC-06-04-06)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/d-ion/"
}