Mass spectrometry 4 Spectrometry technique 1 ,10-phenanthroline 2 Absorption spectroscopy 2 Amino acids 2 Biomolecules 2 Carbohydrates 2 Carbolines 2 Cell pressure 2 Cell sap 2 Crystal atomic structure 2 Density functional theory 2 Electronic transition 2 Ground state 2 Ground state geometry 2 Integrative analysis 2 Kestose 2 Key feature 2 Ligands 2 MALDI 2 MALDI-TOF mass spectrometry 2 MALDI-mass spectrometry 2 Metabolite content 2 Metabolite profiles 2 Metabolite profiling 2 Metabolites 2 Metabolomics 2 Molecular Structure 2 Nano-ESI 2 NanoESI 2