Abstract
Spiking with 18-crown-6/trifluoracetic acid is shown to sequester metal cations thus eliminating unwanted [TAG+Na]+ and [TAG+K]+ ions whereas favoring analyte detection as sole [TAG+H]+ ions in the ESI(+)-MS analysis of methanolic solutions of soybean oil. This sequestering eliminates ion splitting and its resulting isobaric interferences, thus increasing spectra quality greatly facilitates analyte identification. This “one ion per analyte relationship” is highly beneficial for direct infusion analysis of complex mixtures by ESI–MS.
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