Figure 7

MALDI MS investigation of the D. tsuruhatensis 11304 QSI extract. (a) Positive ion MALDI MS spectrum recorded in reflectron mode of the D. tsuruhatensis 11304 QSI extract. (b) Positive ion MS2 spectrum of precursor ion at m/z 400.3. The relative AHL structure is reported in the inset. The position of the hydroxyl groups is tentative.