“…The constant neutral loss acquisition mode, looking for [M + H] + − 15 ions, is well fitted for identifying the presence of compounds such as those listed in Table 2.B, all possessing the N-Me moiety, which is lost yielding quite abundant peaks; the identity of the species can be further confirmed following the fragmentation of such peaks in the product ion mode. All the compounds listed in Table 2.B except for 2-amino-1,7,9-trimethylimidazo[4,5-g]quinoxaline (27) were identified and determined in the cooked meat products, the predominant one being IQ (25a), reaching over 45 ppb, and the scarcest 7 Potentially mutagenic pollutants PBTA-1 (32a) and PBTA-2 (32b), after SPE with an Empore disk C 18 (Section III.A.5), underwent good separation by RP-HPLC without interference by other solutes in the Yodo river waters. Their ESI-MS showed the [M + H] + ion as the base peak at m/z 543 and 508, respectively.…”