Fast atom bombardment mass spectrometry of sodium and potassium oxalates—mass spectrometric evidence for the existence of (sodium–oxalate)–and (potassium–oxalate)–ion pairs in aqueous solutions

The Analyst ◽  
1994 ◽  
Vol 119 (3) ◽  
pp. 377-381 ◽  
Author(s):  
Raj P. Singh ◽  
Ian D. Brindle ◽  
Timothy R. B. Jones ◽  
Jack M. Miller ◽  
Mikio Chiba
Keyword(s):  
Mass Spectrometry ◽  
Aqueous Solutions ◽  
Fast Atom Bombardment ◽  
Ion Pairs ◽  
Mass Spectrometric ◽  
Sodium Oxalate ◽  
Potassium Oxalate ◽  
Mass Spectrometric Evidence ◽  
Oxalate Ion ◽  
Sodium And Potassium

Mass Spectrometry of Oligomeric Cyanines and Squaraines of the Indole Series: Fast Atom Bombardment-Induced Chemical Reactions

2002 ◽  
Vol 57 (4) ◽  
pp. 393-398 ◽  
Author(s):  
Thomas Dülcks ◽  
Walter Grahn ◽  
Hans-Hermann Johannes ◽  
Ulf Lawrentz ◽  
Miriam Rittner ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Chemical Reactions ◽  
Relative Abundance ◽  
Fast Atom Bombardment ◽  
Mass Spectrometric ◽  
Indole Series

Fast atom bombardment (FAB) has been used for mass spectrometric characterization of oligomeric cyanines and squaraines of the indole series which are linked by different aromatic spacers. Markedly different results were obtained for the oligomers and for the corresponding monomers. In addition to the expected mono-anions and mono-cations, ions of high relative abundance were detected which can only be explained on the basis of FAB-induced chemical reactions of the initial oligomers. Formation of allenes, hydrogenation and dehydrogenation, respectively, is characteristic for this class of compounds under FAB-conditions.

5-Decynedioic Acid, an Acetylenic Compound in Human Urine

1975 ◽  
Vol 21 (13) ◽  
pp. 1964-1969 ◽  
Author(s):  
Sven Lindstedt ◽  
Göran Steen
Keyword(s):  
Mass Spectrometry ◽  
Infrared Spectroscopy ◽  
Mass Spectrum ◽  
Dicarboxylic Acid ◽  
Human Urine ◽  
Triple Bond ◽  
Osmium Tetroxide ◽  
Mass Spectrometric ◽  
Acetylenic Compound ◽  
Mass Spectrometric Evidence

Abstract An acetylenic dicarboxylic acid, 5-decynedioic acid, has been isolated from human urine. The structure was determined by mass spectrometry of several derivatives, and by infrared spectroscopy. On osmium tetroxide oxidation, a vic-diketone was formed, the mass spectrum of which established the position of the triple bond between carbon atoms 5 and 6. Mass spectrometric evidence for the presence of a small amount of the isomeric 4-decynedioic acid was also obtained. The 24-h excretion of these acids is 0.01-0.1 mmol for healthy adults on a regular diet.

scholarly journals Electrospray mass spectrometric evidence for the occurrence of two major variants in native pig pepsin A

1996 ◽  
Vol 313 (1) ◽  
pp. 241-244 ◽  
Author(s):  
Brian N. GREEN ◽  
Arwyn T. JONES ◽  
Norman B. ROBERTS
Keyword(s):  
Mass Spectrometry ◽  
Amino Acid ◽  
Amino Acid Residue ◽  
Electrospray Mass Spectrometry ◽  
Mass Spectrometric ◽  
Native Enzyme ◽  
Negative Ion ◽  
Mass Spectrometric Evidence

Native pig pepsin was analysed by negative ion electrospray mass spectrometry in order to rationalize anomalies between the published sequences. Outstanding variations in otherwise identical sequences indicate that amino acid residue 242 is either Asp or Tyr, and in some determinations an additional Ile is inserted at position 230. Mass spectrometric evidence is consistent with the presence, in the native enzyme, of two variants in comparable abundance, with either Asp or Tyr at residue 242. There is no evidence for the additional Ile at position 230.

The contribution of chemical vapor generation coupled with atomic or mass spectrometry to the comprehension of the chemistry of aqueous boranes

2019 ◽  
Vol 34 (5) ◽  
pp. 823-847 ◽  
Author(s):  
Alessandro D'Ulivo
Keyword(s):  
Mass Spectrometry ◽  
Hydride Generation ◽  
Chemical Vapor ◽  
Mass Spectrometric ◽  
Vapor Generation ◽  
Chemical Vapor Generation ◽  
Mass Spectrometric Evidence

Mechanisms of hydride generation by aqueous boranes have been updated in the light of recent atomic and mass spectrometric evidence.

ChemInform Abstract: PHOTOCHEMISTRY OF CO(SEP)3+-OXALATE ION PAIRS: A NOVEL SYSTEM FOR DIHYDROGEN EVOLUTION FROM AQUEOUS SOLUTIONS

1985 ◽  
Vol 16 (31) ◽  
Author(s):  
F. PINA ◽  
Q. G. MULAZZANI ◽  
M. VENTURI ◽  
M. CIANO ◽  
V. BALZANI
Keyword(s):  
Aqueous Solutions ◽  
Ion Pairs ◽  
Oxalate Ion

Photochemistry of Co(sep)3+-oxalate ion pairs: a novel system for dihydrogen evolution from aqueous solutions

1985 ◽  
Vol 24 (6) ◽  
pp. 848-851 ◽  
Author(s):  
Fernando Pina ◽  
Quinto G. Mulazzani ◽  
Margherita Venturi ◽  
Mauro Ciano ◽  
Vincenzo Balzani
Keyword(s):  
Aqueous Solutions ◽  
Ion Pairs ◽  
Oxalate Ion

Fast Atom Bombardment Mass Spectrometric Analysis of Base Hydrolyzed γ-Lactone

1993 ◽  
Vol 76 (4) ◽  
pp. 913-917
Author(s):  
Randall J Baker
Keyword(s):  
Molecular Structure ◽  
Room Temperature ◽  
Fast Atom Bombardment ◽  
Ion Pairs ◽  
Mass Spectrometric ◽  
Spectrometric Analysis ◽  
Thermally Induced ◽  
Fab Mass Spectrometry ◽  
Hydroxy Carboxylic Acid

Abstract Fast atom bombardment (FAB) mass spectrometry (MS) is used to characterize the γ-hydroxy carboxylic acid (γ-HCa) formed from base hydrolyzed γ-lactone at room temperature. Acidification of this base hydrolyzed solution reconverts the γ-HCa back to γ-lactone. Mass shift differences between tetramethylammonium (TMA+) and Na+ ion-pairs with the anionic γ-HCarboxylate(–) (γ-HC(–)) are used to confirm molecular ion identifications. FAB ionization was required to provide mass characterization of the γ-HCa. Electron ionization (El) MS of the γ-HCa was unsuccessful and reconverted γ-HCa back to γ-lactone because of complete thermally induced dehydration. The present paper suggests structures for El fragmentation that support the molecular structure of γ-lactone.

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