Collision-induced dissociation

Collision-induced dissociation (CID), also known as collisionally activated dissociation (CAD), is a mass spectrometry technique to induce fragmentation of selected ions in the gas phase.[1][2] The selected ions (typically molecular ions or protonated molecules) are usually accelerated by applying an electrical potential to increase the ion kinetic energy and then allowed to collide with neutral molecules (often helium, nitrogen, or argon). In the collision, some of the kinetic energy is converted into internal energy which results in bond breakage and the fragmentation of the molecular ion into smaller fragments. These fragment ions can then be analyzed by tandem mass spectrometry.

CID and the fragment ions produced by CID are used for several purposes. Partial or complete structural determination can be achieved. In some cases, identity can be established based on previous knowledge without determining structure. Another use is in simply achieving more sensitive and specific detection. By detecting a unique fragment ion, the precursor ion can be detected in the presence of other ions of the same m/z value (mass-to-charge ratio), reducing the background and increasing the limit of detection.

Low-energy CID and high-energy CID

Low-energy CID is typically carried out with ion kinetic energies less than approximately 1 kiloelectron volt (1 keV). Low-energy CID is highly efficient in fragmenting the selected precursor ions, but the type of fragment ions observed in low-energy CID is strongly dependent on the ion kinetic energy. Very low collision energies favor ion structure rearrangement, and the probability of direct bond cleavage increases as ion kinetic energy increases, leading to higher ion internal energies. High-energy CID (HECID) is carried out in magnetic sector mass spectrometers or tandem magnetic sector mass spectrometers and in tandem time-of-flight mass spectrometers (TOF/TOF). High-energy CID involves ion kinetic energies in the kilovolt range (typically 1 keV to 20 keV). High-energy CID can produce some types of fragment ions that are not formed in low-energy CID, such as charge-remote fragmentation in molecules with hydrocarbon substructures or sidechain fragmentation in peptides.

Triple quadrupole mass spectrometers

In a triple quadrupole mass spectrometer there are three quadrupoles. The first quadrupole termed "Q1" can act as a mass filter and transmits a selected ion and accelerates it towards "Q2" which is termed a collision cell. The pressure in Q2 is higher and the ions collides with neutral gas in the collision cell and are fragmented by CID. The fragments are then accelerated out of the collision cell and enter Q3 which scans through the mass range, analyzing the resulting fragments (as they hit a detector). This produces a mass spectrum of the CID fragments from which structural information or identity can be gained. Many other experiments using CID on a triple quadrupole exist such as precursor ion scans that determine where a specific fragment came from rather than what fragments are produced by a given molecule.

Fourier transform ion cyclotron resonance

Ions trapped in the ICR cell can be excited by applying pulsed electric fields at their resonant frequency to increase their kinetic energy.[3][4] The duration and amplitude of the pulse determines the ion kinetic energy. Because a collision gas present at low pressure requires a long time for excited ions to collide with neutral molecules, a pulsed valve can be used to introduce a short burst of collision gas. Trapped fragment ions or their ion-molecule reaction products can be re-excited for multistage mass spectrometry (MSn).[5] If the excitation is not applied on the resonant frequency, but at a slightly off-resonant frequency, the ions will alternately be excited and de-excited, permitting multiple collisions at low collision energy. Sustained off-resonance irradiation collision-induced dissociation (SORI-CID)[6] is a CID technique used in Fourier transform ion cyclotron resonance mass spectrometry which involves accelerating the ions in cyclotron motion (in a circle inside of an ion trap) in the presence of a collision gas.[7]

Higher-energy collisional dissociation

Higher-energy collisional dissociation (HCD) is a CID technique specific to the orbitrap mass spectrometer in which fragmentation takes place external to the trap.[8] HCD was formerly known as higher-energy C-trap dissociation. In HCD, the ions pass through the C-trap and into the HCD cell, an added multipole collision cell, where dissociation takes place. The ions are then returned to the C-trap before injection into the orbitrap for mass analysis. HCD does not suffer from the low mass cutoff of resonant-excitation (CID) and therefore is useful for isobaric tag–based quantification as reporter ions can be observed. Despite the name, the collision energy of HCD is typically in the regime of low energy collision induced dissociation (less than 100 eV).[8][9]

Fragmentation mechanisms

Homolytic fragmentation is bond dissociation where each of the fragments retains one of the originally-bonded electrons.[10]

Heterolytic fragmentation is bond cleavage where the bonding electrons remain with only one of the fragment species.[11]

In CID, charge remote fragmentation is a type of covalent bond breaking that occurs in a gas phase ion in which the cleaved bond is not adjacent to the location of the charge.[12][13] This fragmentation can be observed using tandem mass spectrometry.[14]

See also
  • Electron-capture dissociation (ECD)
  • Electron-transfer dissociation (ETD)
  • Infrared multiphoton dissociation (IRMPD)

References
  1. Wells JM, McLuckey SA (2005). "Collision‐Induced Dissociation (CID) of Peptides and Proteins". Biological Mass Spectrometry. Methods in Enzymology. Vol. 402. pp. 148–85. doi:10.1016/S0076-6879(05)02005-7. ISBN 9780121828073. PMID 16401509. {{cite book}}: |journal= ignored (help)
  2. Sleno L, Volmer DA (2004). "Ion activation methods for tandem mass spectrometry". Journal of Mass Spectrometry. 39 (10): 1091–112. Bibcode:2004JMSp...39.1091S. doi:10.1002/jms.703. PMID 15481084.
  3. Cody, R.B.; Freiser, B.S. (1982). "Collision-induced dissociation in a fourier-transform mass spectrometer". International Journal of Mass Spectrometry and Ion Physics. 41 (3): 199–204. Bibcode:1982IJMSI..41..199C. doi:10.1016/0020-7381(82)85035-3. ISSN 0020-7381.
  4. Cody, R. B.; Burnier, R. C.; Freiser, B. S. (1982). "Collision-induced dissociation with Fourier transform mass spectrometry". Analytical Chemistry. 54 (1): 96–101. doi:10.1021/ac00238a029. ISSN 0003-2700.
  5. Cody, R. B.; Burnier, R. C.; Cassady, C. J.; Freiser, B. S. (1982). "Consecutive collision-induced dissociations in Fourier transform mass spectrometry". Analytical Chemistry. 54 (13): 2225–2228. doi:10.1021/ac00250a021. ISSN 0003-2700.
  6. Gauthier, J.W.; Trautman, T.R.; Jacobson, D.B. (1991). "Sustained off-resonance irradiation for collision-activated dissociation involving Fourier transform mass spectrometry. Collision-activated dissociation technique that emulates infrared multiphoton dissociation". Analytica Chimica Acta. 246 (1): 211–225. doi:10.1016/s0003-2670(00)80678-9. ISSN 0003-2670.
  7. Laskin, Julia; Futrell, Jean H. (2005). "Activation of large lons in FT-ICR mass spectrometry". Mass Spectrometry Reviews. 24 (2): 135–167. Bibcode:2005MSRv...24..135L. doi:10.1002/mas.20012. ISSN 0277-7037. PMID 15389858.
  8. Olsen JV, Macek B, Lange O, Makarov A, Horning S, Mann M (September 2007). "Higher-energy C-trap dissociation for peptide modification analysis". Nat. Methods. 4 (9): 709–12. doi:10.1038/nmeth1060. PMID 17721543.
  9. Murray, Kermit K.; Boyd, Robert K.; Eberlin, Marcos N.; Langley, G. John; Li, Liang; Naito, Yasuhide (2013). "Definitions of terms relating to mass spectrometry (IUPAC Recommendations 2013)". Pure and Applied Chemistry. 85 (7): 1515. doi:10.1351/PAC-REC-06-04-06. ISSN 1365-3075.
  10. IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) "homolysis (homolytic)". doi:10.1351/goldbook.H02851
  11. IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) "heterolysis (heterolytic)". doi:10.1351/goldbook.H02809
  12. Cheng C, Gross ML (2000), "Applications and mechanisms of charge-remote fragmentation", Mass Spectrom Rev, 19 (6): 398–420, Bibcode:2000MSRv...19..398C, doi:10.1002/1098-2787(2000)19:6<398::AID-MAS3>3.0.CO;2-B, PMID 11199379.
  13. Gross, M. (2000), "Charge-remote fragmentation: an account of research on mechanisms and applications", International Journal of Mass Spectrometry, 200 (1–3): 611–624, Bibcode:2000IJMSp.200..611G, doi:10.1016/S1387-3806(00)00372-9
  14. "Remote-site (charge-remote) fragmentation", Rapid Communications in Mass Spectrometry, 2 (10): 214–217, 1988, Bibcode:1988RCMS....2..214., doi:10.1002/rcm.1290021009
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