CESIUM DESORPTION IONIZATION STUDIES OF BETA-CYCLODEXTRIN BY FOURIER-TRANSFORM MASS-SPECTROMETRY Academic Article uri icon

abstract

  • The mass spectra of -cyclodextrin obtained by Cs+desorption ionization-Fourier transform mass spectrometry are reported. The results from this study illustrate the effects of the Cs+ion beam density on the yield of molecule ions of the type [M+H]+vs. organoalkali ions of the type [M+Na]+, [M+Na(NaX)n]+, and [M+xNa-(x-l)H]+and fragment ions. It is shown that high beam densities favor formation of the organoalkali metal ions, and that abundant [M+H]+molecule ions are formed only at low beam densities. A general mechanism for formation of the organoalkali metal ions is presented, and this mechanism is supported by studies using fast-atom bombardment (FAB) ionization in conjunction with tandem mass spectrometry (TMS). The results from FAB-TMS studies suggest that ions of the types [M+Na(NaX)n]+and [M+-xNa+(NaX)n-x-(x-l)H]+dissociate to produce the organoalkali metal ions, e.g., [M+Na]+and [M+xNa-(x-1)H]+. Based on these results it is suggested that ions of the types [M+Na]+and [M+xNa-(x-1)H]+produced directly by desorption ionization are formed by dissociation of [M+Na(NaX)n]+and [M+xNa+(NaX)n-x-(x-l)H] +ions. 1985, American Chemical Society. All rights reserved.

published proceedings

  • JOURNAL OF THE AMERICAN CHEMICAL SOCIETY

author list (cited authors)

  • CASTRO, M. E., MALLIS, L. M., & RUSSELL, D. H.

citation count

  • 34

complete list of authors

  • CASTRO, ME||MALLIS, LM||RUSSELL, DH

publication date

  • October 1985