Electrospray ionization mass spectrometry ESIMS

Several methods have been developed specifically for naphthenic acids, a class which includes the surface active carboxylate surfactants. Naphthenic acids are present as a complex mixture of a number of homologues with only a small range in molar mass (166-450 mol/g), little change in solubility character, and have been difficult to assay using conventional analytical methods. Methods such as negative ion-mode mass spectrometry using fast atom bombardment (FABMS), have been successfully applied to the analysis of naphthenic acid mixtures [93, 94], Other promising techniques include fluoride ion chemical ionization mass spectrometry (FI-MS) [95], and electrospray ionization mass spectrometry (ESIMS), which may allow for the quantification of the various naphthenic acid fractions [96]. 

However, addition of excess trialkanolamine led to replacement of the terminal isopropoxy group with formation of polynuclear titaniumtrialkanolaminates, which were characterized by NMR and electrospray ionization mass spectrometry (ESIMS). Addition of Bu OOH to this system generated the mononuclear tm-butyl peroxo titanatrane (Bu 00)Ti 0CHRCH2 3N which appears to be Ihe active catalytic species in sulfoxidation (see Table 4.9, p. 276). ... 

The focus of this chapter is on the application of AutoDROP toward structure validation of every member of a substituted 4-phenylbenzopyrans library 1. The results of the NMR interpretation are compared with electrospray-ionization mass spectrometry (ESIMS) and HPLC analysis. A detailed description of... 

On the Mechanism of Electrospray Ionization Mass Spectrometry (ESIMS)... 

Chapter 1 On the Mechanism of Electrospray Ionization Mass Spectrometry (ESIMS) Table 1.1. Onset Voltages, Von. for Solvents with Different Surface Tension, y... 

---