Electrospray ionization and atmospheric pressure matrix-assisted laser desorption/ionization mass spectrometry of antioxidants applied in lubricants

Rapid Communications in Mass Spectrometry : RCM
Alexander KasslerGuenter Allmaier

Abstract

The aim of this study was to investigate the utility of ion trap mass spectrometry (ITMS) in combination with the two desorption/ionization methods, electrospray (ESI) and atmospheric pressure matrix-assisted laser desorption/ionization (AP-MALDI), for the detection of antioxidants which are applied in lubricants. These experiments should form the base for future investigations of antioxidants in tribologically formed thin layers on the surface of frictional systems. Seventeen different antioxidants were selected out of the group of hindered phenolic and aromatic aminic compounds. Practically all antioxidants could be characterized by positive ion ESI- and AP-MALDI-ITMS, forming various types/species of molecular ions (e.g. [M]+*, [M+H]+, [M+Na]+ or [M-2H+H]+). A few compounds could be analyzed by negative ion ESI-MS, too, but none by negative ion AP-MALDI-MS. The influence of target materials in AP-MALDI-MS (gold- and titanium nitride (TiN)-covered stainless steel, micro-diamond-covered hard metal, hand-polished and sand-blasted stainless steel targets) with respect to the molecular ion intensity and type of molecular ion of two selected antioxidants was evaluated. The surface properties are of particular interest because in f...Continue Reading

Citations

Sep 15, 2011·Journal of Mass Spectrometry : JMS·Andreas SchinkovitzPascal Richomme
Jul 22, 2014·Journal of Mass Spectrometry : JMS·Caroline BarrèreAmandine Racaud
Dec 18, 2013·Journal of Mass Spectrometry : JMS·Chuanqing KangYuequan Sun
May 27, 2020·Journal of the American Society for Mass Spectrometry·Tatiana de O Zuppa NetoNelson R Antoniosi Filho

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