Fast atom bombardment- mass spectroscopy

Some polymer materials are too involatile to be investigated by methods based on measurement of total ion currents. 

Mantaudo and co-workers [149] observed the fast atom bombardment (FAB)-MS method which provides information on all the cyclic oligomers of polysulfides detected by GPC, allowing identification of compounds with a molecular weight up to 1500 Da (i.e., nearly at the cut-off of the magnet used). In the absence of low molecular weight compounds, no significant peaks were observed in their FAB mass spectra. Instead, the FAB spectra of the mixtures extracted from the polymers were found to be very similar to those obtained for the crude polymers [150]. 

The molecular ions of pure oligomers and those of the corresponding doped sulfides often appear in the spectra with widely differing intensities, therefore providing an analytical tool to detect specific sulfides in a mixture and, conversely, to investigate the selectivity of metals toward macrocyclic sulfides of different size. 

The previous data show the ability of the FAB-MS technique to detect in three different polysulfides oligomers contained in a mixture, allowing identification of compounds with a molecular weight up to about 1500 Da (Table 2.1). 

---

Fast-atom Bombardment Mass Spectroscopy (FABMS)... 

The average DS as determined by these methods provides only the simplest characterization of these derivatives, and further analysis was necessary to characterize the mixture of SBE bands of different levels of substitution. Due to the presence of the anionic sulfonate substituent, it is possible to use capillary electrophoresis (23), to separate the SBE-CD substitution bands and to characterize the fingerprint of the composition (Fig. 10). Anion exchange chromatography (24) was utilized to isolate separate substitution bands (mono- to deca-derivatives) that were subsequently identified by NMR and fast atom bombardment mass spectroscopy (FAB-MS). 

Single-crystal X-ray crystallography remains the only definitive technique for the structural characterization of heteronuclear gold cluster compounds, although other techniques, in particular Mossbauer, NMR, IR, and fast atom bombardment mass spectroscopies (FABMS), have yielded valuable information, especially concerning the nature of these species in solution. Electron spectroscopy, which has proved to be of great value in the identification of homonuclear gold cluster compounds (210) has received little attention by workers in this area,... 

Fast atom bombardment mass spectroscopy has proved to be most useful when applied to the characterization of heteronuclear gold cluster compounds containing hydride ligands (137,149,155). Characterization is aided by the observation that peaks are invariably present in the spectrum corresponding to ions that contain all of the hydride... 

BASIL CIS CV CVD DSSC ECALE EC-STM EDX, EDS, EDAX EIS EMF EQCM FAB MS FFG-NMR Biphasic Acid Scavenging Utilizing Ionic Liquids Copper-indium-selenide Cyclic Voltammetry Chemical Vapor Deposition Dye Sensitized Solar Cell Electrochemical Atomic Layer Epitaxy Electrochemical in situ scanning tunnelling microscopy Energy Dispersive X-ray analysis Electrochemical Impedance Spectroscopy Electromotive Force Electrochemical Quarz Crystal Microbalance Fast atom bombardment mass spectroscopy Fixed Field Gradient Nuclear Magnetic Resonance... 

From a practical perspective the chlorozincate liquids are easier to make and handle than the corresponding chloroaluminates as they are less susceptible to hydrolysis. As with the aluminum-based liquids the electrochemistry is dominated by the complex anions present in the liquid, which depend upon the composition and the relative Lewis acidity. There is some evidence, however, that hydrolysis of zinc Lewis basic melts does occur as Hsiu et al. used fast atom bombardment mass spectroscopy (FAB MS) to show that some zinc species do contain oxygen [105]. 

Costello CE, Brodack JW, Jones AG, Davison A, Johnson DL, Kasina S, Fritzberg AR (1983) The investigation of radiopharmaceutical components by fast atom bombardment mass spectroscopy the identification of Tc-HIDA and the epimers of TC-CO2DADS. J Nucl Med 24 353-355... 

We reported that Hm transformants of A. chrysogenum expressing only the DAO gene, as well as some transformants of pHDVll having DAO and weak acylase activities, prO duced GL 7 ACA and GL 7-ADACA (6,7). However, those products were detected as products of different retention times compared with those of standard samples under a newly developed analysis condition of HPLC. Those products were isolated and ana-lyzed by side chains of those products were analyzed by an isomer... 

---