Differentiation of flavonoid glycoside isomers by using metal complexation and electrospray ionization mass spectrometry.

Silver complexation and tandem mass spectrometry for differentiation of isomeric flavonoid diglycosides.

For detection and differentiation of isomeric flavonoids, electrospray ionization mass spectrometry is used to generate silver complexes of the type (Ag + flavonoid)+. Collisionally activated dissociation (CAD) of the resulting 1:1 silver/flavonoid complexes allows isomer differentiation of flavonoids. Eighteen flavonoid diglycosides constituting seven isomeric series are distinguishable from e...

Influence of cation adduction on the separation characteristics of flavonoid diglycoside isomers using dual gate-ion mobility-quadrupole ion trap mass spectrometry.

An electrospray ionization-dual gate-ion mobility-quadrupole ion trap mass spectrometer was used to evaluate the separation characteristics of isomeric flavonoid diglycosides adducted with sodium, potassium, and silver. This instrumental configuration allows ions to be selectively accumulated within the ion trap on the basis of their gas phase conformation prior to mass analysis. For the metal ...

Rapid trace detection of triacetone triperoxide (TATP) by complexation reactions during desorption electrospray ionization.

Desorption electrospray ionization (DESI) mass spectrometry is used for rapid, specific and sensitive detection of trace amounts of the notorious explosive TATP present on ambient surfaces by alkali metal complexation in a simple spray technique.

Determination of zinc to beta-peptide binding constants with electrospray ionization mass spectrometry.

We present an improvement of the titration method for binding constant determination with electrospray ionization (ESI) mass spectrometry that is unaffected by differences in ESI response of measured species in solution. The method consists of a calibration and titration, both using an internal standard that allows relative quantitation. This avoids artifacts such as a decrease in overall signa...

Electrospray Ionization Mass Spectrometry for Me chanism Analysis of Metal Ion Complexation and P hotoionization of Malachite Green Derivatives In corporating a Crown Ether Moiety