Determination of the glycosylation site of flavonoid monoglucosides by metal complexation and tandem mass spectrometry

Journal of the American Society for Mass Spectrometry
Barry D Davis, Jennifer S Brodbelt

Abstract

Metal complexation and tandem mass spectrometry were used to differentiate C- and O-bonded flavonoid monoglucoside isomers. Electrospray ionization of solutions containing a flavonoid glycoside and a metal salt led to the generation of the key [M(II) (L) (L-H)](+) complexes, where M is the metal ion and L is the flavonoid glycoside. Thirteen flavonoid monoglucosides were examined in combination with Ca(II), Mg(II), Co(II), Ni(II), and Cu(II). Collisional activated dissociation (CAD) of the [M(II) (L) (L-H)](+) complexes resulted in diagnostic mass spectra, in contrast to the CAD mass spectra of the protonated, deprotonated, and sodium-cationized flavonoid glucosides. Five common sites of glycosylation could be predicted based on the fragmentation patterns of the flavonoid glucoside/magnesium complexes, while flavonoid glucoside/calcium complexes also were effective for location of the glycosylation site when MS(3) was employed. Cobalt, nickel and copper complexation had only limited success in this application. The metal complexation methods were also applied for characterization of a flavonoid rhamnoside, and the dissociation pathways of the metal complexes indicate that flavonoid rhamnosides have distinctive dissociation feat...Continue Reading

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Citations

Apr 23, 2013·Journal of Molecular Modeling·Dariusz ToczekRoman Gancarz
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Jan 28, 2005·Journal of Mass Spectrometry : JMS·Junmei ZhangJennifer S Brodbelt

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