title: Ionization of an analyte in solution.
mesh_terms: D001704:Biopolymers / Q000032:analysis*; D049673:History, 20th Century; D007477:Ions / Q000302:isolation & purification*; D009930:Organic Chemicals / Q000032:analysis*; D012996:Solutions; D021241:Spectrometry, Mass, Electrospray Ionization / Q000266:history*
chemical_list: D001704:Biopolymers; D007477:Ions; D009930:Organic Chemicals; D012996:Solutions