FIG. 2.

HPLC fractionation and ESI MS-MS fragmentation of the toxin from S. griseus 8/ppi and commercial valinomycin. (A) HPLC elution profiles of the extract from S. griseus 8/ppi and commercial valinomycin ESI-MS-MS fragmentation patterns of an ammonium adduct of the toxin purified from S. griseus 8/ppi (ion m/z 1,128.84) (B) and of an ammonium adduct of commercial valinomycin (ion m/z 1,128.64). (C) Samples were dissolved in 50% methanol containing ammonium acetate for the MS analysis. The peak numbers correspond to the fragment ions assigned in Table 2. The peaks marked with asterisks represent loss of water.