Fast atom bombardment
ThermoQuest AvantGarde MS with quadrupole detector and FAB/EI source.
|Related||Secondary ion mass spectrometry
Matrix-assisted laser desorption/ionization
Plasma desorption mass spectrometry
Fast atom bombardment (FAB) is an ionization technique used in mass spectrometry. When used in mass spectrometry, the method is also known as liquid secondary ion mass spectrometry. The material to be analyzed is mixed with a non-volatile chemical protection environment called a matrix and is bombarded under vacuum with a high energy (4000 to 10,000 electron volts) beam of atoms. The atoms are typically from an inert gas such as argon or xenon. Common matrices include glycerol, thioglycerol, 3-nitrobenzyl alcohol (3-NBA), 18-Crown-6 ether, 2-nitrophenyloctyl ether, sulfolane, diethanolamine, and triethanolamine. This technique is similar to secondary ion mass spectrometry and plasma desorption mass spectrometry.
How it works
FAB is a relatively soft ionization technique and produces primarily intact protonated molecules denoted as [M+H]+ and deprotonated molecules such as [M-H]-. The nature of its ionization products places it close to electrospray and MALDI.
The first example of the practical application of this technique was the elucidation of the amino acid sequence of the oligopeptide efrapeptin D. This contained a variety of very unusual amino acid residues. The sequence was shown to be: N-acetyl-L-pip-AIB-L-pip-AIB-AIB-L-leu-beta-ala-gly-AIB-AIB-L-pip-AIB-gly-L-leu-L-iva-AIB-X. PIP = pipecolic acid, AIB = alpha-amino-isobutyric acid, leu = leucine, iva = isovaline, gly = glycine. This is a potent inhibitor of the mitochodrial ATPase activity.
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- "Fast Atom Bombardment." The University of Maryland Chemistry Department. N.p., 2009. Web. 16 May 2014. <http://www.chem.umd.edu/wp-content/uploads/2009/09/FAB_ionSource.pdf>.
- Tomer KB (1989). "The development of fast atom bombardment combined with tandem mass spectrometry for the determination of biomolecules". Mass Spectrometry Reviews 8 (6): 445–82. doi:10.1002/mas.1280080602.
- Bullough,D.A., Jackson C.G.,Henderson, P.J.F., Cottee, F.H.,Beechey,R.B. and Linnett, P.E. Biochemistry International (1981) 4, 543-549