ionization article 22 priority journal 18 Ionization 14 controlled study 14 Mass spectrometry 12 mass spectrometry 12 unclassified drug 12 Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization 10 carbohydrate analysis 10 chemical analysis 8 desorption 8 nonhuman 8 tandem mass spectrometry 8 Carbohydrates 6 Electrospray ionization 6 Electrospray ionization mass spectrometry 6 Spectrometry, Mass, Electrospray Ionization 6 chemistry 6 gentisic acid 6 harman 6 ionosphere 6 matrix assisted laser desorption ionization time of flight mass spectrometry 6 metabolite 6 molecular weight 6 nitrogen 6 1 ketose 4 1f fructofuramosylnystose 4 2 hydroxypropyl beta cyclodextrin 4 Acids 4