During the positive-ion mode electrospray ionization mass spectrometry analysis of 1,4-diphenyl-3-benzoyl-1,4-dihydropyridines with methanol as the solvent, the major ion generated is one mass unit lower than the analyte, which can be rationalized as the oxidative aromatization of 1,4-dihydropyridines to pyridine cations.

Pneumatically assisted electrospray mass spectrometry (ESMS) in the direct mode and as a chromatographic detection technique was developed for the characterization of horse kidney metallothionein isoforms. Direct analysis in an acidic medium showed the presence of three major and five minor isoforms, the molecular masses of which were determined. The presence of the major isoforms (two of which...

A kinetic mixture of self-assembled subphthalocyanine-based capsules was shown to gradually reorganize into its more stable symmetrical components by electrospray mass spectrometry.

Addition of a lipophilic ionic liquid to non-polar, hydrocarbon solvents (such as hexane and toluene) permits electrospray ionisation mass spectrometric analysis of dissolved analytes.

Oligosaccharides were prepared through mild hydrochloric acid hydrolysis of -carrageenan from Kappaphycus striatum carrageenan. Three oligosaccharides were purified by strong-anion exchange high-performance chromatography. Their structure was elucidated using mass spectral and NMR data. Negative-ion electrospray ionization (ESI) mass spectra at different fragmentor voltages provided the molecul...

Abstract Electrospray thrusters are of particular interest for micropropulsion because their compactness, high specific impulse, and ability to operate over very long periods time. However, particles on the periphery plume susceptible collide with extractor grid, which may reduce efficiency limit lifetime electrospray thruster. Therefore, a thorough characterization collision process byproducts...