Abstract
An immunoadjuvant saponin fraction from Quillaja brasiliensis leaves was investigated by direct infusion and liquid chromatography/electrospray ionization ion trap multiple-stage mass spectrometry in negative ion mode (DI-ESI-IT-MSn and LC-ESI-IT-MSn). The aglycone and the sequence of the oligosaccharide residues at C-3 and C-28 were characterized based on MS2 and MS3 experiments of the [MH]− ions. According to their [MH]− ions, characteristic product ions and retention times, 27 bidesmosidic saponins, bearing four types of triterpenic aglycones, were tentatively identified.
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