Abstract
Negative-ion chemical ionization (NCI) and collisionally activated mass spectra are presented for heptafluorobutyryl (HFB) esters of eight trichothecenes. The ion-source conditions have a dramatic effect on the NCI spectra and only at low source temperatures can intense parent ions, i.e., M − for bis- and tris-HFB esters (neosolaniol, HT-2 Toxin, monoacetosyscirpenol, fusarenon-X and deoxynivalenol) and [M-HF] − for mono-HFB esters (T-2 Toxin, Iso-T-2 Toxin, and diacetoxyscirpenol), be generated. High selectivity and a sensitivity down to picogram (0.2-2pg) levels were achieved with gas chromatography/NCI tandem mass spectrometry. Application to a spiked oats sample is described.
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