Letter: Identification of non proteinogenic amino acids from the collisionally activated decomposition (CAD) spectra of the immonium ions obtained in fast atom bombardment (FAB) mass spectra of peptides

1996 ◽  
Vol 2 (1) ◽  
pp. 145 ◽  
Author(s):  
S. Castet ◽  
F. Cavellier ◽  
C. Enja;ba; ◽  
J. Verducci ◽  
J.-L. Aubagnac
Keyword(s):  
Amino Acids ◽  
Mass Spectra ◽  
Fast Atom Bombardment ◽  
Letter Identification ◽  
Immonium Ions ◽  
Fab Mass Spectra

Fast Atom Bombardment Mass Spectrometry of the Vitamin B12 Analogues Hydrogenobalamin and Cupribalamin

1984 ◽  
Vol 39 (2) ◽  
pp. 248-251 ◽  
Author(s):  
Lutz Grotjahn ◽  
Volker B. Koppenhagen ◽  
Ludger Ernst
Keyword(s):  
Mass Spectrometry ◽  
Mass Spectrum ◽  
Mass Spectra ◽  
Fast Atom Bombardment ◽  
Metal Clusters ◽  
Cobalt Atom ◽  
Vitamin B ◽  
Metal Free ◽  
Characteristic Fragment ◽  
Fab Mass Spectra

Hydrogenobalam in (metal-free vitamin B12) and cupribalamin are characterized by their fast atom bombardment (FAB) mass spectra which show molecular ion and characteristic fragment ion peaks. These spectra and the high-resolution FAB mass spectrum of cobalamin (vitamin B12) show that the (M+H)+-CN-59 peak for the latter is due to loss of acetamide and not of the central cobalt atom. In the FAB mass spectrum of cupribalamin metal clusters are observed

Ligand Exchange in FAB Mass Spectrometry of Monomerie and Dimeric Corrinoids

1984 ◽  
Vol 39 (11) ◽  
pp. 1548-1552 ◽  
Author(s):  
Lutz Grotjahn ◽  
Ludger Ernst
Keyword(s):  
Mass Spectrometry ◽  
Ligand Exchange ◽  
Mass Spectra ◽  
Fast Atom Bombardment ◽  
Molecular Ions ◽  
Negative Ion ◽  
Fab Mass Spectrometry ◽  
Fab Mass Spectra

Abstract In the Fast Atom Bombardment (FAB) mass spectra of monomeric and dimeric corrinoids, exchange of metal-bound ligands against matrix particles is observed which leads to pseudo molecular ions. Negative ion FAB mass spectra in particular, give distinct information on the intact molecular units.

Fast-atom Bombardment (FAB) Mass Spectra of Nitrile or Cyanamide Complexes with the {M(Ph2PCH2CH2PPh2)2}n+ (M=Fe or Re) Metal Sites. Application to Reactions Induced under FAB Conditions

1996 ◽  
Vol 10 (4) ◽  
pp. 447-454 ◽  
Author(s):  
Luísa M. D. R. S. Martins ◽  
M. Fátima C. Guedes da Silva ◽  
Indalécio Marques ◽  
Joäo J. R. Fraústo da Silva ◽  
M. Cândida N. Vaz ◽  
...  
Keyword(s):  
Mass Spectra ◽  
Fast Atom Bombardment ◽  
Fab Mass Spectra

Biosynthesis of isochorismate in Klebsiella pneumoniae: origin of O-2

1991 ◽  
Vol 37 (4) ◽  
pp. 276-280 ◽  
Author(s):  
Lolita O. Zamir ◽  
Kenneth A. Devor ◽  
Roy A. Jensen ◽  
Robert Tiberio ◽  
Françoise Sauriol ◽  
...  
Keyword(s):  
Amino Acids ◽  
Natural Products ◽  
Mass Spectra ◽  
Biosynthetic Pathway ◽  
Fast Atom Bombardment ◽  
Claisen Rearrangement ◽  
Aromatic Amino Acids ◽  
Hydroxyl Group ◽  
Chorismic Acid ◽  
Important Branch

The shikimate metabolites are key precursors to a large number of natural products, including aromatic amino acids. Chorismic acid is an important branch point in the biosynthetic pathway to aromatic amino acids. Chorismic acid is also unique among natural products since it is the only compound known to undergo an enzymatic Claisen rearrangement. A metabolite of chorismic acid, isochorismic acid, first observed in Aerobacter aerogenes differs in its chemical structure by the location of the hydroxyl group and the double bonds. Isochorismic acid is a precursor to a growing number of shikimate-derived metabolites. Isochorismic acid has also been postulated to be an intermediate of m-carboxyaromatic amino acids, implying another enzymatic Claisen rearrangement. In this publication, we have isolated isochorismate synthase and found that on lyophilization the enzyme is stable for at least 6 months at −20 °C. Incubation of chorismate with this preparation in water enriched with 18O led to incorporation of one atom of 18O as proven from the fast atom bombardment mass spectra of the HPLC purified derived isochorismate. Key words: chorismate, isochorismate, rearrangement, H218O, isochorismate synthetase.

Fast atom bombardment (FAB) mass spectra of protein digests: Hen and duck egg-white lysozymes

1984 ◽  
Vol 11 (11) ◽  
pp. 549-556 ◽  
Author(s):  
Toshifumi Takao ◽  
Masakuni Yoshida ◽  
Yeong-Man Hong ◽  
Saburo Aimoto ◽  
Yasutsugu Shimonishi
Keyword(s):  
Mass Spectra ◽  
Fast Atom Bombardment ◽  
Egg White ◽  
Protein Digests ◽  
Duck Egg ◽  
Fab Mass Spectra

A comparison of the electron impact and fast atom bombardment mass spectra of some group IV organometallic halides

1985 ◽  
Vol 63 (8) ◽  
pp. 2308-2312 ◽  
Author(s):  
Jack M. Miller ◽  
Adrian Fulcher
Keyword(s):  
Electron Impact ◽  
Condensed Phase ◽  
Mass Spectra ◽  
Fast Atom Bombardment ◽  
Group Iv ◽  
Major Exception ◽  
Positive Ion ◽  
Fab Mass Spectra ◽  
Primary Ionization

The positive ion fast atom bombardment (FAB) mass spectra of a series of group IV organometallic halides, (phenyl)3MCl (M = Ge, Sn, Pb), (phenyl)3PbX (X = Cl, Br, I) and Sn(phenyl)nCl4−n are reported in a sulfolane matrix, and compared to their corresponding EI spectra. The use of other matrix liquids such as glycerol thioglycerol, diamylphenol, 18-crown-6/tetraglyme, and p-nitrophenyloctylether are discussed. Disappointingly FAB, like EI, does not produce significant parent ions for group IV organometallics. The FAB and EI spectra are remarkably similar with one major exception. In EI, the loss of a phenyl is preferred over the loss of a halide, while in FAB the reverse is the case, strongly suggesting that the primary ionization occurs in the condensed phase.

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