Fast atom bombardment, a new method of ionizing molecules for mass spectrometry, has been found to be particularly applicable to molecules of an involatile nature. The mass spectra of vitamin BIZ and related cobalamines are reported together with the mass spectrum of the coenzyme of vitamin BIZ. Fully resolved spectra, containing both molecular species and structurally significant fragmentation are reported for the first time.

A study of various surfactants using FABMS and surface tension measurements is described. A correlation between surface structure and FAB mass spectral response is reported with its possible significance in the ionisation mechanism.

Mass measurements of the protonated molecules [M + H]+ of four insulins are presented. In addition, structurally significant fragment ions are observed in the mass spectrum and metastable scanning has been used to link these ions to the protonated molecule.

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