Tandem Mass Spectrometry (MS/MS)
Tandem Mass Spectrometry (MS/MS) — A technique using two stages of mass analysis for peptide fragmentation and sequencing, enabling identification of unknown peptides.
What Is Tandem Mass Spectrometry?
Tandem mass spectrometry (MS/MS or MS2) involves two stages of mass analysis: the first selects a specific precursor ion, the second analyzes the fragment ions produced by collision-induced dissociation (CID). For peptides, MS/MS provides amino acid sequence information by generating a ladder of b- and y-ions that can be read like a molecular barcode.
Instrument Configurations
- Triple quadrupole (QQQ): Workhorse for targeted quantification (MRM mode). Highest sensitivity for known peptides
- Q-TOF: Quadrupole-time-of-flight. High resolution accurate mass (HRAM) for identification and characterization
- Orbitrap: Ultra-high resolution (>100,000). Gold standard for peptidomics and PTM mapping
- Ion trap: MSn capability (multiple fragmentation stages) for structural elucidation
Frequently Asked Questions
What is Tandem Mass Spectrometry (MS/MS)?
A technique using two stages of mass analysis for peptide fragmentation and sequencing, enabling identification of unknown peptides.
Why is Tandem Mass Spectrometry (MS/MS) important in peptide research?
Tandem Mass Spectrometry (MS/MS) is a fundamental concept in analytical as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.
Authority Sources
- Tandem Mass Spectrometry (MS/MS) on Wikipedia
- Search Tandem Mass Spectrometry (MS/MS) on PubChem (NIH)
- Research articles on ScienceDirect