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A novel desalting method, using a column switching technique and a volatile ion-pairing reagent, pentadecafluorooctanoic acid, was developed. This system allows hydrophilic and cationic compounds in a nonvolatile buffer to be directly introduced into a mass spectrometer for structural elucidation. The desalting procedure consists of four steps: (1) the fractionation of a target compound from a separation...
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