Electron spray

Peaks are analyzed separately by their retention times, absorption, and fluorescence properties. RCCs show absorbance maxima near A.500 and 316 nm. For FCCs, UV-Vis specna show two prominent bands near 361 and 320 mn and a luminescence maximum at 436 mn and NCCs show UV-Vis spectra with absorbance maxima near 320 and 210 nm. Nevertheless, as none of these approaches is suitable for elucidating structures, it is necessary to apply additional MS and NMR analyses to fully characterize snuctural features. Electron spray ionization (ESI) and high-resolution EAB mass spectroscopy have been applied to elucidate the molecular formulae of colorless compounds. ... 

Castellanos-Santiago E and Yahia EM. 2008. Identification and quantification of betalaines from the fruits of 10 Mexican prickly pear cultivars by high-performance liquid chromatography and electron spray ionization mass spectrometry. J Agric Food Chem 56 5758-5764. 

Data were obtained by electron spray mass spectrometry analysis. 

Hamscher G., S. Sczesny, H. Hdper, and H. Nau (2002). Determination of persistent tetracycline residues in soil fertilized with liquid manure by high-performance liquid chromatography with electron spray ionization tandem mass spectrometry. Analytical Cheminstry 74 1509-1518. 

Gu, L. et al.. Liquid chromatography/electron spray ionization mass spectrometric studies of proanthocyanidins in foods, J. Mass Spectrom., 38, 1272, 2003. 

Mass spectrometry (MS) is a very sensitive method of determining the mass of native proteins, as well as their purity. The two most common techniques are ESI-MS (electron spray ionization-MS) and MALDI-TOF-MS (matrix-assisted laser... 

From the analyses of NMR and electron-spray ionization mass (ESI-MS) spectroscopy, the polymers obtained from the polymerization of cyclic disulfides were found to be a cyclic structure [202], The cyclic structure consisting of poly(DT) is assumed to be formed by a backbiting reaction of propagating species [203]. Thermal and mechanical properties of the polymers, and decomposition behaviors of the polymers demonstrate that the polymers obtained from thermal polymerization of cyclic disulfides include a polycatenane structure. From polymerization of cyclic disulfides in the presence of cyclic polyethylene oxide), a polycatenane consisting of two different cyclic polymers was obtained [199]. Thus, poly(DT) contains spatial entanglements of cyclic polymers with each other (a polycatenane structure was presumed) (Fig. 61). 

Electron-spray interface VG QUATTRO quadruple mass spectrometer (VG Instruments Inc., Altrincham, UK). 

Eluted fractions are analyzed by electron-spray interface on a VG QUATTRO quadruple mass spectrometer, freeze-dried, and dissolved in distilled, pyrogen-free water immediately prior to use. 

The native molecular weight (M) of 83.0 kdal is determined independently with electron spray ionization mass spectrometry. If the protein is spherical and unhydrated, its radius (r0) can be estimated by... 

The thus prepared ligands la-le-H4 are introduced into coordination studies with titanium(IV) ions in the presence of base (M2C03 M = Li, Na, K) with methanol as solvent. Negative ESI-MS (electron spray ionization mass spectrometry) of the obtained orange-red solids in methanol reveals that coordination compounds of general formula M2[l2(OCH3)2Ti2] are formed (Scheme 1.3.2) [20, 21]. 

Hitachi announced the development of the third commercial microprobe instrument, the ion microprobe analyzer IMA-2 in 1969 [30]. This instrument placed a scintillator close to the sample for secondary electron imaging. A Wien filter, for primary beam mass selection [31], and an electron spray, for charge compensation on insulating samples [32], were added later. 

Boroles have been routinely analyzed by mass spectrometry but only as far as to deduce their molecular mass. Electron impact, chemical ionization, and electron spray ionization methods have been used. No reports on the fragmentation patterns of boroles have been published to date. 

ESIMS Electron spray ionization mass spectrum... 

Produce ions from neutral molecules in the vapor phase. This takes place in the ion source. As can be seen in Fig. 1, there are several modes of ion sources. Of those, the most used in LC-MS are electron spray ionization (ESI), chemical ionization (Cl), thermospray ionization (TSP), fast-atom bombardment (FAB), and electron impact (El). 

Fig. 1 Schematic representation of a mass spectrometer depicting its main components and the different modes used. Abbreviations DIP direct insertion probe DEP direct exposure probe GC gas chromatography LC liquid chromatography CE capillary chromatography TEC thin-layer chromatography FEE field-flow fractionation APCI atmospheric pressure ionization El electron impact Cl chemical ionization FAB fast-atom bombardment PD plasma desorption MALDI matrix-assisted laser desorption ionization ED laser desorption TSP thermospray ESI electron spray ionization HSI hypherthermal surface ionization Q quadropole QQQ triple quadropole TOE time-of-fiight FTMS Fourier transform mass spectrometer IT ion trap EM electrom multiplier PM photomultiplier ICR ion cyclotron resonance.

EGE (epidermal growth factor) 238, 463 EGER (epidermal growth factor receptor) 59, 105, 623 Elastase 380 Elcatonin 476 Elcitonin Inj. 20S 476 Electromechanical (NOGA) mapping 155 Electron spray ionization (ESI) 1564 Electronic standards for transmission of regulatory information (ESTRI) 1699 Electrophoretic methods... 

Ir (CH2CN)(Me3tpa)] + in acetonitrile and [Ir" (CH2COMe)(Me3tpa)] + in acetone has been detected with ESI-MS (ESI-MS = electron-spray ionisation mass spectrometry). 

---