1Mass Spectrometry Laboratory, National Institute of Research-Development for Electrochemistry and Condensed Matter, Timisoara, Romania, Plautius Andronescu Str.1, 300224, Timisoara, Romania
2Faculty of Physics, West University of Timisoara, Romania, Blvd. V. Parvan 4, 300223, Timisoara, Romania
3Biochemistry and Proteomics Group, Department of Chemistry and Biomolecular Science, Clarkson University, 8 Clarkson Avenue Potsdam, NY, 13699-5810, USA