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Fig. 6 | BMC Microbiology

Fig. 6

From: Inhibition of bacteriochlorophyll biosynthesis in the purple phototrophic bacteria Rhodospirillumrubrum and Rhodobacter capsulatus grown in the presence of a toxic concentration of selenite

Fig. 6

Schematic representation of the tandem MS-spectrum of the signal at m/z 599.3/598.3. a: Spectrum of the signal obtained from the Se0-nanoparticle samples isolated from cultures of R. rubrum: Red bars. Comparison with the spectrum of the reference PPIX-O-CH3: Green bars. The bond cleavage(s) corresponding to the fragment loss(es) are indicated in parentheses on top of each bar representing the molecular ions obtained in these MS/MS-spectra. b: Proposed structure for the molecule yielding the MS-signal at m/z 599.3 or m/z 598.3 with indication of bond cleavage locations. It is based on: 1: The absence of this signal in acid particle sample extracts (demetalation). 2: The high fragmentation similarity between the analyte and PPIX-O-CH3 yielding a mass difference of 21 or 22 m. u. between each molecular ion (Table 4)

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BMC Microbiology

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