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Figure 7


Fig. 7. (A) Collisionally induced dissociation of the deprotonated molecular ion BMSF. The ion at m/z 333 fragments to lose water and CO2. Ions at m/z155 (OHC.C6H10.COO-) and 193 ([C4H3O].C6H10.COO-), are characteristic; both lose CO2 under further MS3 dissociation. (B) Electron impact mass spectrum of the methyl ester O-trimethylsilyl ether of BMSF showing ions at m/z 492 (M+.), 351 and 243 are characteristic of an 8,X-diHEPE. (C) Catalytic hydrogenation of the A240 material results in the formation of 8,13-dihydroxy eicosanoic acid, with characteristic ions at m/z 502 (M+.), 201, 245, 322, 359 and 403.





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